0.4x^2=2.1

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Solution for 0.4x^2=2.1 equation: 


Simplifying
0.4x2 = 2.1

Solving
0.4x2 = 2.1

Solving for variable 'x'.

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

Divide each side by '0.4'.
x2 = 5.25

Simplifying
x2 = 5.25

Take the square root of each side:
x = {-2.291287847, 2.291287847}

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