| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
Solve for z:
z2 + 2z - 32 = 2z + 4
| 8 or -2 | |
| 5 or -2 | |
| 6 or -6 | |
| 3 or -9 |
The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:
z2 + 2z - 32 = 2z + 4
z2 + 2z - 32 - 4 = 2z
z2 + 2z - 2z - 36 = 0
z2 - 36 = 0
Next, factor the quadratic equation:
z2 - 36 = 0
(z - 6)(z + 6) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (z - 6) or (z + 6) must equal zero:
If (z - 6) = 0, z must equal 6
If (z + 6) = 0, z must equal -6
So the solution is that z = 6 or -6
If a = c = 2, b = d = 3, what is the area of this rectangle?
| 40 | |
| 6 | |
| 16 | |
| 8 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 2 x 3
a = 6
Factor y2 + y - 56
| (y - 7)(y + 8) | |
| (y - 7)(y - 8) | |
| (y + 7)(y - 8) | |
| (y + 7)(y + 8) |
To factor a quadratic expression, apply the FOIL method (First, Outside, Inside, Last) in reverse. First, find the two Last terms that will multiply to produce -56 as well and sum (Inside, Outside) to equal 1. For this problem, those two numbers are -7 and 8. Then, plug these into a set of binomials using the square root of the First variable (y2):
y2 + y - 56
y2 + (-7 + 8)y + (-7 x 8)
(y - 7)(y + 8)
Which of the following expressions contains exactly two terms?
quadratic |
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polynomial |
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monomial |
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binomial |
A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.
A(n) __________ is two expressions separated by an equal sign.
equation |
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expression |
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problem |
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formula |
An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.