4+x*x=40

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Solution for 4+x*x=40 equation: 


Simplifying
4 + x * x = 40

Multiply x * x
4 + x2 = 40

Solving
4 + x2 = 40

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + x2 = 40 + -4

Combine like terms: 4 + -4 = 0
0 + x2 = 40 + -4
x2 = 40 + -4

Combine like terms: 40 + -4 = 36
x2 = 36

Simplifying
x2 = 36

Take the square root of each side:
x = {-6, 6}

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