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Simplifying
0 = -9x2 + -28 + 64
Reorder the terms:
0 = -28 + 64 + -9x2
Combine like terms: -28 + 64 = 36
0 = 36 + -9x2
Solving
0 = 36 + -9x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '9x2' to each side of the equation.
0 + 9x2 = 36 + -9x2 + 9x2
Remove the zero:
9x2 = 36 + -9x2 + 9x2
Combine like terms: -9x2 + 9x2 = 0
9x2 = 36 + 0
9x2 = 36
Divide each side by '9'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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