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Simplifying
9x2 + -16 = 121
Reorder the terms:
-16 + 9x2 = 121
Solving
-16 + 9x2 = 121
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '16' to each side of the equation.
-16 + 16 + 9x2 = 121 + 16
Combine like terms: -16 + 16 = 0
0 + 9x2 = 121 + 16
9x2 = 121 + 16
Combine like terms: 121 + 16 = 137
9x2 = 137
Divide each side by '9'.
x2 = 15.22222222
Simplifying
x2 = 15.22222222
Take the square root of each side:
x = {-3.901566637, 3.901566637}
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