8x^2-21=51

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Solution for 8x^2-21=51 equation: 


Simplifying
8x2 + -21 = 51

Reorder the terms:
-21 + 8x2 = 51

Solving
-21 + 8x2 = 51

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 8x2 = 51 + 21

Combine like terms: -21 + 21 = 0
0 + 8x2 = 51 + 21
8x2 = 51 + 21

Combine like terms: 51 + 21 = 72
8x2 = 72

Divide each side by '8'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}

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