2x*x+8=40

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Solution for 2x*x+8=40 equation: 


Simplifying
2x * x + 8 = 40

Multiply x * x
2x2 + 8 = 40

Reorder the terms:
8 + 2x2 = 40

Solving
8 + 2x2 = 40

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 = 40 + -8

Combine like terms: 8 + -8 = 0
0 + 2x2 = 40 + -8
2x2 = 40 + -8

Combine like terms: 40 + -8 = 32
2x2 = 32

Divide each side by '2'.
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}

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