A trapezoid is a quadrilateral with one set of parallel sides.

The area of a triangle is equal to ½ base x height:

a = ½bh
a = ½ x 8 x 2 = \( \frac{16}{2} \) = 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 16 as well and sum (Inside, Outside) to equal -10. For this problem, those two numbers are -8 and -2. Then, plug these into a set of binomials using the square root of the First variable (y²):

y² - 10y + 16
y² + (-8 - 2)y + (-8 x -2)
(y - 8)(y - 2)

To solve this equation, 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.

-2x - 1 = 3 - x
-2x = 3 - x + 1
-2x + x = 3 + 1
-x = 4
x = \( \frac{4}{-1} \)
x = -4

An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.