2x^2+8=21

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Solution for 2x^2+8=21 equation: 


Simplifying
2x2 + 8 = 21

Reorder the terms:
8 + 2x2 = 21

Solving
8 + 2x2 = 21

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 + 2x2 = 21 + -8

Combine like terms: 8 + -8 = 0
0 + 2x2 = 21 + -8
2x2 = 21 + -8

Combine like terms: 21 + -8 = 13
2x2 = 13

Divide each side by '2'.
x2 = 6.5

Simplifying
x2 = 6.5

Take the square root of each side:
x = {-2.549509757, 2.549509757}

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