The area of a parallelogram is equal to its length x width:

a = l x w
a = a x b
a = 1 x 5
a = 5

A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.

To solve this equation, isolate the variable for which you are solving (b) on one side of the equation and put everything else on the other side.

4b - 3x = -2b + 9x + 6
4b = -2b + 9x + 6 + 3x
4b + 2b = 9x + 6 + 3x
6b = 12x + 6
b = \( \frac{12x + 6}{6} \)
b = \( \frac{12x}{6} \) + \( \frac{6}{6} \)
b = 2x + 1

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

a² + 9a + 20 = 0
(a + 4)(a + 5) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (a + 4) or (a + 5) must equal zero:

If (a + 4) = 0, a must equal -4
If (a + 5) = 0, a must equal -5

So the solution is that a = -4 or -5

A monomial contains one term, a binomial contains two terms, and a polynomial contains more than two terms.