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Simplifying
3(x2 + -1) = 9
Reorder the terms:
3(-1 + x2) = 9
(-1 * 3 + x2 * 3) = 9
(-3 + 3x2) = 9
Solving
-3 + 3x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '3' to each side of the equation.
-3 + 3 + 3x2 = 9 + 3
Combine like terms: -3 + 3 = 0
0 + 3x2 = 9 + 3
3x2 = 9 + 3
Combine like terms: 9 + 3 = 12
3x2 = 12
Divide each side by '3'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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