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 + 5x - 3 = 3x + 5
x² + 5x - 3 - 5 = 3x
x² + 5x - 3x - 8 = 0
x² + 2x - 8 = 0

Next, factor the quadratic equation:

x² + 2x - 8 = 0
(x - 2)(x + 4) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (x - 2) or (x + 4) must equal zero:

If (x - 2) = 0, x must equal 2
If (x + 4) = 0, x must equal -4

So the solution is that x = 2 or -4

A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.

The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 4 x 2) + (2 x 2 x 4) + (2 x 4 x 4)
sa = (16) + (16) + (32)
sa = 64

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.

(3a)(2ab) + (8a²)(3b)
(3 x 2)(a x a x b) + (8 x 3)(a² x b)
(6)(a¹⁺¹ x b) + (24)(a²b)
6a²b + 24a²b
30a²b