X^2-40=9

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Solution for X^2-40=9 equation: 


Simplifying
X2 + -40 = 9

Reorder the terms:
-40 + X2 = 9

Solving
-40 + X2 = 9

Solving for variable 'X'.

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

Add '40' to each side of the equation.
-40 + 40 + X2 = 9 + 40

Combine like terms: -40 + 40 = 0
0 + X2 = 9 + 40
X2 = 9 + 40

Combine like terms: 9 + 40 = 49
X2 = 49

Simplifying
X2 = 49

Take the square root of each side:
X = {-7, 7}

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