(6-r)(6+r)=

Solution for (6-r)(6+r)= equation:

Simplifying
(6 + -1r)(6 + r) = 0

Multiply (6 + -1r) * (6 + r)
(6(6 + r) + -1r * (6 + r)) = 0
((6 * 6 + r * 6) + -1r * (6 + r)) = 0
((36 + 6r) + -1r * (6 + r)) = 0
(36 + 6r + (6 * -1r + r * -1r)) = 0
(36 + 6r + (-6r + -1r2)) = 0

Combine like terms: 6r + -6r = 0
(36 + 0 + -1r2) = 0
(36 + -1r2) = 0

Solving
36 + -1r2 = 0

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-36' to each side of the equation.
36 + -36 + -1r2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + -1r2 = 0 + -36
-1r2 = 0 + -36

Combine like terms: 0 + -36 = -36
-1r2 = -36

Divide each side by '-1'.
r2 = 36

Simplifying
r2 = 36

Take the square root of each side:
r = {-6, 6}