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

c² - 8c + 16 = 0
(c - 4)(c - 4) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, (c - 4) must equal zero:

If (c - 4) = 0, c must equal 4

So the solution is that c = 4

A cube is a rectangular solid box with a height (h), length (l), and width (w). The volume is h x l x w and the surface area is 2lw x 2wh + 2lh.

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.

7a⁸ + 9a⁸ = 16a⁸

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.

Perimeter is equal to the sum of the four sides:

p = a + b + c + d
p = 1 + 7 + 2 + 2
p = 12