4+9x^2=40

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Solution for 4+9x^2=40 equation: 


Simplifying
4 + 9x2 = 40

Solving
4 + 9x2 = 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 + 9x2 = 40 + -4

Combine like terms: 4 + -4 = 0
0 + 9x2 = 40 + -4
9x2 = 40 + -4

Combine like terms: 40 + -4 = 36
9x2 = 36

Divide each side by '9'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}

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