x*x+16=25

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Solution for x*x+16=25 equation: 


Simplifying
x * x + 16 = 25

Multiply x * x
x2 + 16 = 25

Reorder the terms:
16 + x2 = 25

Solving
16 + x2 = 25

Solving for variable 'x'.

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

Add '-16' to each side of the equation.
16 + -16 + x2 = 25 + -16

Combine like terms: 16 + -16 = 0
0 + x2 = 25 + -16
x2 = 25 + -16

Combine like terms: 25 + -16 = 9
x2 = 9

Simplifying
x2 = 9

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

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