All Algebra II Resources
Example Questions
Example Question #141 : Understanding Quadratic Equations
Given , what is the value of the discriminant?
The correct answer is . The discriminant is equal to portion of the quadratic formula. In this case, "" corresponds to the coefficient of , "" corresponds to the coefficient of , and "" corresponds to . So, the answer is , which is equal to .
Example Question #301 : Intermediate Single Variable Algebra
Find the value of the discriminant and state the number of real and imaginary solutions.
57, 2 real solutions
57, 2 imaginary solutions
-7, 2 real solutions
-7, 2 imaginary solutions
57, 1 real solution
57, 2 real solutions
Given the quadratic equation of
The formula for the discriminant is (remember this as a part of the quadratic formula?)
Plugging in values to the discriminant equation:
So the discriminant is 57. What does that mean for our solutions? Since it is a positive number, we know that we will have 2 real solutions. So the answer is:
57, 2 real solutions
Example Question #1 : Quadratic Roots
Give the solution set of the equation .
Using the quadratic formula, with :
Example Question #1 : Quadratic Roots
Give the solution set of the equation .
Using the quadratic formula, with :
Example Question #142 : Understanding Quadratic Equations
Write a quadratic equation in the form with 2 and -10 as its roots.
Write in the form where p and q are the roots.
Substitute in the roots:
Simplify:
Use FOIL and simplify to get
.
Example Question #4 : Quadratic Roots
Find the roots of the following quadratic polynomial:
This quadratic has no real roots.
To find the roots of this equation, we need to find which values of make the polynomial equal zero; we do this by factoring. Factoring is a lot of "guess and check" work, but we can figure some things out. If our binomials are in the form , we know times will be and times will be . With that in mind, we can factor our polynomial to
To find the roots, we need to find the -values that make each of our binomials equal zero. For the first one it is , and for the second it is , so our roots are .
Example Question #143 : Understanding Quadratic Equations
Write a quadratic equation in the form that has and as its roots.
1. Write the equation in the form where and are the given roots.
2. Simplify using FOIL method.
Example Question #2 : Quadratic Roots
Give the solution set of the following equation:
Use the quadratic formula with , and :
Example Question #1 : Quadratic Roots
Give the solution set of the following equation:
Use the quadratic formula with , , and :
Example Question #144 : Understanding Quadratic Equations
Let
Determine the value of x.
To solve for x we need to isolate x. We can do this by taking the square root of each side and then doing algebraic operations.
Now we need to separate our equation in two and solve for each x.
or