(.4x)(x)=1440

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Solution for (.4x)(x)=1440 equation: 


Simplifying
(0.4x)(x) = 1440

Remove parenthesis around (0.4x)
0.4x(x) = 1440

Multiply x * x
0.4x2 = 1440

Solving
0.4x2 = 1440

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 = 3600

Simplifying
x2 = 3600

Take the square root of each side:
x = {-60, 60}

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