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Simplifying
3x(x) + 9 = 84
Multiply x * x
3x2 + 9 = 84
Reorder the terms:
9 + 3x2 = 84
Solving
9 + 3x2 = 84
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-9' to each side of the equation.
9 + -9 + 3x2 = 84 + -9
Combine like terms: 9 + -9 = 0
0 + 3x2 = 84 + -9
3x2 = 84 + -9
Combine like terms: 84 + -9 = 75
3x2 = 75
Divide each side by '3'.
x2 = 25
Simplifying
x2 = 25
Take the square root of each side:
x = {-5, 5}
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