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Simplifying
9x(9x) + -16 = 0
Remove parenthesis around (9x)
9x * 9x + -16 = 0
Reorder the terms for easier multiplication:
9 * 9x * x + -16 = 0
Multiply 9 * 9
81x * x + -16 = 0
Multiply x * x
81x2 + -16 = 0
Reorder the terms:
-16 + 81x2 = 0
Solving
-16 + 81x2 = 0
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 + 81x2 = 0 + 16
Combine like terms: -16 + 16 = 0
0 + 81x2 = 0 + 16
81x2 = 0 + 16
Combine like terms: 0 + 16 = 16
81x2 = 16
Divide each side by '81'.
x2 = 0.1975308642
Simplifying
x2 = 0.1975308642
Take the square root of each side:
x = {-0.444444444, 0.444444444}
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