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ISEE Upper Level Math : Variables

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Example Questions

Example Question #9 : How To Find The Exponent Of Variables

Simplify:

$(\frac{x^2y}{2z^3})^{-2}$

Possible Answers:

$\frac{4z^6}{x^6y^2}$

$\frac{4z^8}{x^4y^2}$

$\frac{4z^6}{x^4y^2}$

$\frac{z^6}{x^4y^2}$

$\frac{4z^6}{x^4y}$

Correct answer:

$\frac{4z^6}{x^4y^2}$

Explanation:

First, recognize that raising the fraction to a negative power is the same as raising the inverted fraction to a positive power.

$(\frac{x^2y}{2z^3})^{-2}=(\frac{2z^3}{x^2y})^2$

Apply the exponent within the parentheses and simplify.

$\frac{(2z^3)^2}{(x^2y)^2}$

$\frac{2^2(z^3)^2}{(x^2)^2y^2}$

$\frac{4z^{(3\times 2)}}{x^{(2\times 2)}y^2}$

$\frac{4z^6}{x^4y^2}$

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Example Question #10 : How To Find The Exponent Of Variables

Simplify if $x\neq 0,-1$ and $y\neq 0$ .

$\frac{x^3y+2x^2y+xy}{xy(x+1)}$

Possible Answers:

2x+1

2x-1

x+1

x-1

Correct answer:

x+1

Explanation:

Begin by factoring the numerator and denominator. can be factored out of each term.

$\frac{x^3y+2x^2y+xy}{xy(x+1)}=\frac{xy(x^2+2x+1)}{xy(x+1)}$

can be canceled, since it appears in both the numerator and denomintor.

$\frac{x^2+2x+1}{x+1}$

Next, factor the numerator.

$\frac{(x^2+2x+1)}{x+1}=\frac{(x+1)(x+1)}{x+1}$

Simplify.

$\frac{(x+1)(x+1)}{x+1}=x+1$

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Example Question #971 : Isee Upper Level (Grades 9 12) Mathematics Achievement

$\frac{1}{3}+ \sqrt{y}= \frac{2}{5}$

Evaluate .

Possible Answers:

$\frac{1}{225 }$

$\frac{9}{64}$

$\frac{121}{225 }$

$\frac{1}{4}$

Correct answer:

$\frac{1}{225 }$

Explanation:

$\frac{1}{3}+ \sqrt{y}= \frac{2}{5}$

$\frac{1}{3}+ \sqrt{y}- \frac{1}{3}= \frac{2}{5} - \frac{1}{3}$

$\sqrt{y} = \frac{2}{5} - \frac{1}{3}$

$\sqrt{y} = \frac{3 \cdot 2}{3 \cdot 5} - \frac{1 \cdot 5}{3 \cdot 5}$

$\sqrt{y} = \frac{6}{1 5} - \frac{ 5}{15}$

$\sqrt{y} = \frac{6- 5}{15}$

$\sqrt{y} = \frac{1}{15}$

$y = (\sqrt{y}) ^{2}= \left (\frac{1}{15} \right )^{2} = \frac{1^{2}}{15 ^{2}} = \frac{1}{225 }$

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Example Question #972 : Isee Upper Level (Grades 9 12) Mathematics Achievement

$\sqrt{y}-\frac{1}{3} = \frac{2}{5}$

Evaluate .

Possible Answers:

$\frac{9}{64}$

$\frac{121}{225 }$

$\frac{1}{225 }$

$\frac{1}{4}$

Correct answer:

$\frac{121}{225 }$

Explanation:

To solve for the variable isolate it on one side of the equation with all of constants on the other side.

$\sqrt{y}-\frac{1}{3} = \frac{2}{5}$

First add one third to both sides.

$\sqrt{y}-\frac{1}{3} + \frac{1}{3} = \frac{2}{5} + \frac{1}{3}$

$\sqrt{y} = \frac{2}{5} + \frac{1}{3}$

Calculate a common denominator to add the two fractions.

$\sqrt{y} = \frac{3 \cdot 2}{3 \cdot 5} + \frac{1 \cdot 5}{3 \cdot 5}$

$\sqrt{y} = \frac{6}{1 5} + \frac{ 5}{15}$

$\sqrt{y} = \frac{6+ 5}{15}$

$\sqrt{y} = \frac{11}{15}$

Square both sides to solve for y.

$y = (\sqrt{y}) ^{2}= \left (\frac{11}{15} \right )^{2} = \frac{11^{2}}{15 ^{2}} = \frac{121}{225 }$

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Example Question #973 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Simplify the following:

(7t^6h^4b^9)^3

Possible Answers:

$11t^{9}h^{7}b^{12}$

$343t^{9}h^{7}b^{12}$

$21t^{9}h^{7}b^{12}$

$343t^{18}h^{12}b^{27}$

Correct answer:

$343t^{18}h^{12}b^{27}$

Explanation:

Simplify the following:

(7t^6h^4b^9)^3

Let's recall the rules for distributing exponents.

We treat coefficients (like the 7) like regular numbers and raise them to the new exponent.

We deal with variables (like the t, h, and b) by multiplying their current exponent by the new exponent.

Doing so yields:

$7^3t^{6*3}h^{3*4}b^{3*9}$

Simplify to get:

$343t^{18}h^{12}b^{27}$

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Example Question #974 : Isee Upper Level (Grades 9 12) Mathematics Achievement

$a^{3} = -10$

Evaluate $(2a) ^{6}$ .

Possible Answers:

200

6,400

-6,400

Correct answer:

6,400

Explanation:

By the Power of a Power Principle,

$(a^{3} ) ^{2} =a ^{3 \cdot 2} = a ^{6}$

$a ^{6} = (a^{3} ) ^{2} = (-10) ^{2} =+ (10 ^{2} )= 100$

Also, by the Power of a Product Principle,

$(2a) ^{6} = 2^{6} \cdot a ^{6}$

$2 ^{6} = 64$ , so, substituting,

$(2a) ^{6} = 64 ( 100 ) = 6,400$ .

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Example Question #975 : Isee Upper Level (Grades 9 12) Mathematics Achievement

$t ^{3} = -8$

$u^{9} = -12$

Evaluate $(tu) ^{9}$ .

Possible Answers:

-6,144

6,144

288

Correct answer:

6,144

Explanation:

By the Power of a Product Principle,

$(tu) ^{9} = t ^{9} \cdot u ^{9}$

Also, by the Power of a Power Principle,

$(t^{3} ) ^{3} =t ^{3 \cdot 3} = t^{9}$

Combining these ideas, then substituting:

$(tu) ^{9} = (t^{3} ) ^{3} \cdot u ^{9}$

$= (-8) ^{3} \cdot (-12)$

$= (-8^{3} ) \cdot (-12)$

$= (-512 ) \cdot (-12)$

$= +(512 \cdot 12)$

=6,144

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Example Question #271 : Algebraic Concepts

Simplify the expression:

$7x^{3} - 5x^{2} + 9x^{3}$

Possible Answers:

The expression cannot be simplified further.

$-2x^{3} - 5x^{2}$

$16 x^{3} - 5x^{2}$

$11x^{5}$

$2x^{2} + 9x^{3}$

Correct answer:

$16 x^{3} - 5x^{2}$

Explanation:

Group, then collect like terms:

$7x^{3} - 5x^{2} + 9x^{3}$

$=7x^{3} + 9x^{3} - 5x^{2}$

$=\left ( 7 + 9 \right )x^{3} - 5x^{2}$

$=16x^{3} - 5x^{2}$

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Example Question #272 : Algebraic Concepts

Simplify:

$\frac{(x+2y)^{2} - (x - 2y)^{2}}{xy}$

Possible Answers:

$\frac{2x^{2}+8y^{2}}{xy}$

8xy

-8xy

Correct answer:

Explanation:

$\frac{(x+2y)^{2} - (x - 2y)^{2}}{xy}$

$=\frac{(x^{2}+4xy+4y^{2})-(x^{2}-4xy+4y^{2})}{xy}$

$=\frac{x^{2}-x^{2}+4xy+4xy+4y^{2}-4y^{2}}{xy}$

$=\frac{8xy}{xy} = 8$

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Example Question #273 : Algebraic Concepts

Assume that $x \neq 0$ . Which of the following expressions is equivalent to:

$\frac{\left (x+1 \right ) ^{3} - \left ( x^{3 } + 1\right ) }{x^{2}}$ ?

Possible Answers:

$2 + \frac{ 2 }{x}$

$3 + \frac{ 3 }{x}$

$\frac{ 3 }{x} + \frac{ 3 }{x^{2}}$

$\frac{ 2 }{x} + \frac{ 2 }{x^{2}}$

Correct answer:

$3 + \frac{ 3 }{x}$

Explanation:

$\frac{\left (x+1 \right ) ^{3} - \left ( x^{3 } + 1\right ) }{x^{2}}$

$= \frac{\left (x^{3} +3x^{2} + 3x + 1 ) - \left ( x^{3 } + 1\right ) }{x^{2}}$

$= \frac{x^{3} -x^{3} +3x^{2} + 3x + 1-1}{x^{2}}$

$= \frac{3x^{2} + 3x }{x^{2}}$

$= \frac{3x^{2} }{x^{2}} + \frac{ 3x }{x^{2}}$

$=3 + \frac{ 3 }{x}$

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All ISEE Upper Level Math Resources

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ISEE Upper Level Math : Variables

Study concepts, example questions & explanations for ISEE Upper Level Math

All ISEE Upper Level Math Resources

Example Questions

Example Question #9 : How To Find The Exponent Of Variables

Example Question #10 : How To Find The Exponent Of Variables

Example Question #971 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Example Question #972 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Example Question #973 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Example Question #974 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Example Question #975 : Isee Upper Level (Grades 9 12) Mathematics Achievement

Example Question #271 : Algebraic Concepts

Example Question #272 : Algebraic Concepts

Example Question #273 : Algebraic Concepts

All ISEE Upper Level Math Resources

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