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Simplifying
(u + -9)(u + 9) = 0
Reorder the terms:
(-9 + u)(u + 9) = 0
Reorder the terms:
(-9 + u)(9 + u) = 0
Multiply (-9 + u) * (9 + u)
(-9(9 + u) + u(9 + u)) = 0
((9 * -9 + u * -9) + u(9 + u)) = 0
((-81 + -9u) + u(9 + u)) = 0
(-81 + -9u + (9 * u + u * u)) = 0
(-81 + -9u + (9u + u2)) = 0
Combine like terms: -9u + 9u = 0
(-81 + 0 + u2) = 0
(-81 + u2) = 0
Solving
-81 + u2 = 0
Solving for variable 'u'.
Move all terms containing u to the left, all other terms to the right.
Add '81' to each side of the equation.
-81 + 81 + u2 = 0 + 81
Combine like terms: -81 + 81 = 0
0 + u2 = 0 + 81
u2 = 0 + 81
Combine like terms: 0 + 81 = 81
u2 = 81
Simplifying
u2 = 81
Take the square root of each side:
u = {-9, 9}
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