-4x^2=-81

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Solution for -4x^2=-81 equation: 


Simplifying
-4x2 = -81

Solving
-4x2 = -81

Solving for variable 'x'.

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

Divide each side by '-4'.
x2 = 20.25

Simplifying
x2 = 20.25

Take the square root of each side:
x = {-4.5, 4.5}

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