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Simplifying
(9 + -7u)(9 + 7u) = 0
Multiply (9 + -7u) * (9 + 7u)
(9(9 + 7u) + -7u * (9 + 7u)) = 0
((9 * 9 + 7u * 9) + -7u * (9 + 7u)) = 0
((81 + 63u) + -7u * (9 + 7u)) = 0
(81 + 63u + (9 * -7u + 7u * -7u)) = 0
(81 + 63u + (-63u + -49u2)) = 0
Combine like terms: 63u + -63u = 0
(81 + 0 + -49u2) = 0
(81 + -49u2) = 0
Solving
81 + -49u2 = 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 + -49u2 = 0 + -81
Combine like terms: 81 + -81 = 0
0 + -49u2 = 0 + -81
-49u2 = 0 + -81
Combine like terms: 0 + -81 = -81
-49u2 = -81
Divide each side by '-49'.
u2 = 1.653061224
Simplifying
u2 = 1.653061224
Take the square root of each side:
u = {-1.285714286, 1.285714286}
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