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Simplifying
-3(x2 + -4) = 9
Reorder the terms:
-3(-4 + x2) = 9
(-4 * -3 + x2 * -3) = 9
(12 + -3x2) = 9
Solving
12 + -3x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-12' to each side of the equation.
12 + -12 + -3x2 = 9 + -12
Combine like terms: 12 + -12 = 0
0 + -3x2 = 9 + -12
-3x2 = 9 + -12
Combine like terms: 9 + -12 = -3
-3x2 = -3
Divide each side by '-3'.
x2 = 1
Simplifying
x2 = 1
Take the square root of each side:
x = {-1, 1}
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