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Simplifying
5x2 + 12 + -3x2 = 20
Reorder the terms:
12 + 5x2 + -3x2 = 20
Combine like terms: 5x2 + -3x2 = 2x2
12 + 2x2 = 20
Solving
12 + 2x2 = 20
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-12' to each side of the equation.
12 + -12 + 2x2 = 20 + -12
Combine like terms: 12 + -12 = 0
0 + 2x2 = 20 + -12
2x2 = 20 + -12
Combine like terms: 20 + -12 = 8
2x2 = 8
Divide each side by '2'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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