9-400x^2=0

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Solution for 9-400x^2=0 equation: 


Simplifying
9 + -400x2 = 0

Solving
9 + -400x2 = 0

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + -400x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -400x2 = 0 + -9
-400x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-400x2 = -9

Divide each side by '-400'.
x2 = 0.0225

Simplifying
x2 = 0.0225

Take the square root of each side:
x = {-0.15, 0.15}

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