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Simplifying
-3x2 + -2x + 21 = -2x
Reorder the terms:
21 + -2x + -3x2 = -2x
Add '2x' to each side of the equation.
21 + -2x + 2x + -3x2 = -2x + 2x
Combine like terms: -2x + 2x = 0
21 + 0 + -3x2 = -2x + 2x
21 + -3x2 = -2x + 2x
Combine like terms: -2x + 2x = 0
21 + -3x2 = 0
Solving
21 + -3x2 = 0
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 = 0 + -21
Combine like terms: 21 + -21 = 0
0 + -3x2 = 0 + -21
-3x2 = 0 + -21
Combine like terms: 0 + -21 = -21
-3x2 = -21
Divide each side by '-3'.
x2 = 7
Simplifying
x2 = 7
Take the square root of each side:
x = {-2.645751311, 2.645751311}
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