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Simplifying
3x2 + -21 = 45
Reorder the terms:
-21 + 3x2 = 45
Solving
-21 + 3x2 = 45
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 = 45 + 21
Combine like terms: -21 + 21 = 0
0 + 3x2 = 45 + 21
3x2 = 45 + 21
Combine like terms: 45 + 21 = 66
3x2 = 66
Divide each side by '3'.
x2 = 22
Simplifying
x2 = 22
Take the square root of each side:
x = {-4.69041576, 4.69041576}
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