2x^2-20=78

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Solution for 2x^2-20=78 equation: 


Simplifying
2x2 + -20 = 78

Reorder the terms:
-20 + 2x2 = 78

Solving
-20 + 2x2 = 78

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '20' to each side of the equation.
-20 + 20 + 2x2 = 78 + 20

Combine like terms: -20 + 20 = 0
0 + 2x2 = 78 + 20
2x2 = 78 + 20

Combine like terms: 78 + 20 = 98
2x2 = 98

Divide each side by '2'.
x2 = 49

Simplifying
x2 = 49

Take the square root of each side:
x = {-7, 7}

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