0.5x^2=20

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Solution for 0.5x^2=20 equation: 


Simplifying
0.5x2 = 20

Solving
0.5x2 = 20

Solving for variable 'x'.

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

Divide each side by '0.5'.
x2 = 40

Simplifying
x2 = 40

Take the square root of each side:
x = {-6.32455532, 6.32455532}

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