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Simplifying
3x2 + -21 = 27
Reorder the terms:
-21 + 3x2 = 27
Solving
-21 + 3x2 = 27
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 = 27 + 21
Combine like terms: -21 + 21 = 0
0 + 3x2 = 27 + 21
3x2 = 27 + 21
Combine like terms: 27 + 21 = 48
3x2 = 48
Divide each side by '3'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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