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Simplifying
21 = 2x2 + 2
Reorder the terms:
21 = 2 + 2x2
Solving
21 = 2 + 2x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-2x2' to each side of the equation.
21 + -2x2 = 2 + 2x2 + -2x2
Combine like terms: 2x2 + -2x2 = 0
21 + -2x2 = 2 + 0
21 + -2x2 = 2
Add '-21' to each side of the equation.
21 + -21 + -2x2 = 2 + -21
Combine like terms: 21 + -21 = 0
0 + -2x2 = 2 + -21
-2x2 = 2 + -21
Combine like terms: 2 + -21 = -19
-2x2 = -19
Divide each side by '-2'.
x2 = 9.5
Simplifying
x2 = 9.5
Take the square root of each side:
x = {-3.082207001, 3.082207001}
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