| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
Solve for a:
a2 + 14a + 45 = 0
| -3 or -9 | |
| -3 or -6 | |
| -5 or -9 | |
| -1 or -2 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
a2 + 14a + 45 = 0
(a + 5)(a + 9) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (a + 5) or (a + 9) must equal zero:
If (a + 5) = 0, a must equal -5
If (a + 9) = 0, a must equal -9
So the solution is that a = -5 or -9
On this circle, line segment AB is the:
circumference |
|
chord |
|
diameter |
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radius |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).
A trapezoid is a quadrilateral with one set of __________ sides.
equal angle |
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right angle |
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parallel |
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equal length |
A trapezoid is a quadrilateral with one set of parallel sides.
On this circle, a line segment connecting point A to point D is called:
chord |
|
circumference |
|
diameter |
|
radius |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).
What is 5a7 - 2a7?
| 3a7 | |
| a714 | |
| 7a14 | |
| 10a7 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
5a7 - 2a7 = 3a7