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Simplifying
3(x2 + -7) = 9
Reorder the terms:
3(-7 + x2) = 9
(-7 * 3 + x2 * 3) = 9
(-21 + 3x2) = 9
Solving
-21 + 3x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '21' to each side of the equation.
-21 + 21 + 3x2 = 9 + 21
Combine like terms: -21 + 21 = 0
0 + 3x2 = 9 + 21
3x2 = 9 + 21
Combine like terms: 9 + 21 = 30
3x2 = 30
Divide each side by '3'.
x2 = 10
Simplifying
x2 = 10
Take the square root of each side:
x = {-3.16227766, 3.16227766}
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