(v-9)(v+9)=

Solution for (v-9)(v+9)= equation:

Simplifying
(v + -9)(v + 9) = 0

Reorder the terms:
(-9 + v)(v + 9) = 0

Reorder the terms:
(-9 + v)(9 + v) = 0

Multiply (-9 + v) * (9 + v)
(-9(9 + v) + v(9 + v)) = 0
((9 * -9 + v * -9) + v(9 + v)) = 0
((-81 + -9v) + v(9 + v)) = 0
(-81 + -9v + (9 * v + v * v)) = 0
(-81 + -9v + (9v + v2)) = 0

Combine like terms: -9v + 9v = 0
(-81 + 0 + v2) = 0
(-81 + v2) = 0

Solving
-81 + v2 = 0

Solving for variable 'v'.

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

Add '81' to each side of the equation.
-81 + 81 + v2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + v2 = 0 + 81
v2 = 0 + 81

Combine like terms: 0 + 81 = 81
v2 = 81

Simplifying
v2 = 81

Take the square root of each side:
v = {-9, 9}