| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
Solve for x:
x2 - 4 = 0
| 2 or -7 | |
| 2 or -2 | |
| 9 or 7 | |
| -1 or -4 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
x2 - 4 = 0
(x - 2)(x + 2) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (x - 2) or (x + 2) must equal zero:
If (x - 2) = 0, x must equal 2
If (x + 2) = 0, x must equal -2
So the solution is that x = 2 or -2
If the length of AB equals the length of BD, point B __________ this line segment.
intersects |
|
bisects |
|
midpoints |
|
trisects |
A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.
What is 7a9 + 3a9?
| 4 | |
| 10a9 | |
| 10a18 | |
| 10 |
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.
7a9 + 3a9 = 10a9
If side x = 10cm, side y = 13cm, and side z = 7cm what is the perimeter of this triangle?
| 26cm | |
| 30cm | |
| 31cm | |
| 18cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 10cm + 13cm + 7cm = 30cm
If angle a = 42° and angle b = 48° what is the length of angle c?
| 90° | |
| 106° | |
| 83° | |
| 124° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 42° - 48° = 90°