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Simplifying
2x2 + -28 = 100
Reorder the terms:
-28 + 2x2 = 100
Solving
-28 + 2x2 = 100
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '28' to each side of the equation.
-28 + 28 + 2x2 = 100 + 28
Combine like terms: -28 + 28 = 0
0 + 2x2 = 100 + 28
2x2 = 100 + 28
Combine like terms: 100 + 28 = 128
2x2 = 128
Divide each side by '2'.
x2 = 64
Simplifying
x2 = 64
Take the square root of each side:
x = {-8, 8}
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