7x^2-8=839

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Solution for 7x^2-8=839 equation: 


Simplifying
7x2 + -8 = 839

Reorder the terms:
-8 + 7x2 = 839

Solving
-8 + 7x2 = 839

Solving for variable 'x'.

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

Add '8' to each side of the equation.
-8 + 8 + 7x2 = 839 + 8

Combine like terms: -8 + 8 = 0
0 + 7x2 = 839 + 8
7x2 = 839 + 8

Combine like terms: 839 + 8 = 847
7x2 = 847

Divide each side by '7'.
x2 = 121

Simplifying
x2 = 121

Take the square root of each side:
x = {-11, 11}

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