All GMAT Math Resources
Example Questions
Example Question #3 : How To Graph Complex Numbers
In which quadrant does the complex number lie?
If we graphed the given complex number on a set of real-imaginary axes, we would plot the real value of the complex number as the x coordinate, and the imaginary value of the complex number as the y coordinate. Because the given complex number is as follows:
We are essentially doing the same as plotting the point on a set of Cartesian axes. We move units left of the origin in the x direction, and units down from the origin in the y direction, which puts us in the third quadrant, or in terms of Roman numerals:
Example Question #2 : How To Graph Complex Numbers
In which quadrant does the complex number lie?
If we graphed the given complex number on a set of real-imaginary axes, we would plot the real value of the complex number as the x coordinate, and the imaginary value of the complex number as the y coordinate. Because the given complex number is as follows:
We are essentially doing the same as plotting the point on a set of Cartesian axes. We move units right of the origin in the x direction, and units up from the origin in the y direction, which puts us in the first quadrant, or in terms of Roman numerals:
Example Question #1 : Graphing Complex Numbers
Raise to the power of four.
None of the other responses gives the correct answer.
Squaring an expression, then squaring the result, amounts to taking the original expression to the fourth power. Therefore, we can first square :
Now square this result:
Example Question #2 : Graphing Complex Numbers
Raise to the power of eight.
For any expression , . That is, we can raise an expression to the power of eight by squaring it, then squaring the result, then squaring that result.
First, we square:
Square this result to obtain the fourth power:
Square this result to obtain the eighth power:
Example Question #1 : How To Graph Inverse Variation
Give the vertical asymptote of the graph of the equation
The vertical asymptote is , where is found by setting the denominator equal to 0 and solving for :
This is the equation of the vertical asymptote.
Example Question #1 : Graphing Inverse Variation
Give the -intercept(s), if any, of the graph of the equation
The graph has no -intercept.
The graph has no -intercept.
Set in the equation and solve for .
This is impossible, so the equation has no solution. Therefore, the graph has no -intercept.
Example Question #192 : Graphing
Give the -intercept(s), if any, of the graph of the equation
The graph has no -intercept.
Set in the equation and solve for .
The -intercept is
Example Question #1 : Graphing Inverse Variation
Give the horizontal asymptote, if there is one, of the graph of the equation
The graph of the equation has no horizontal asymptote.
To find the horizontal asymptote, we can divide both numerator and denominator in the right expression by :
As approaches positive or negative infinity, and both approach 0. Therefore, approaches , making the horizontal asymptote the line of the equation .
Example Question #2 : Graphing Inverse Variation
Give the -intercept of the graph of the equation .
The graph has no -intercept.
Set in the equation:
The -intercept is .
Example Question #1 : Graphing A Two Step Inequality
Which of the following inequalities is graphed above?
First, we determine the equation of the boundary line. This line includes points and , so the slope can be calculated as follows:
We can find the slope-intercept form of the line by substituting
in the following equation:
The equation of the boundary line is .
The boundary is excluded, as is indicated by the line being dashed, so the equality symbol is replaced by either or . To find out which one, we can test a point in the solution set - for ease, we will choose :
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0 is greater than so the correct symbol is .
The correct choice is .