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

a = l x w
a = a x b
a = 3 x 9
a = 27

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(2a)(4ab) + (3a²)(9b)
(2 x 4)(a x a x b) + (3 x 9)(a² x b)
(8)(a¹⁺¹ x b) + (27)(a²b)
8a²b + 27a²b
35a²b

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.

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:

x² - 14 = -3x + 4
x² - 14 - 4 = -3x
x² + + 3x - 18 = 0
x² + 3x - 18 = 0

Next, factor the quadratic equation:

x² + 3x - 18 = 0
(x - 3)(x + 6) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (x - 3) or (x + 6) must equal zero:

If (x - 3) = 0, x must equal 3
If (x + 6) = 0, x must equal -6

So the solution is that x = 3 or -6