(y*0.8)*y=40

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Solution for (y*0.8)*y=40 equation: 


Simplifying
(y * 0.8) * y = 40

Reorder the terms for easier multiplication:
(0.8y) * y = 40

Remove parenthesis around (0.8y)
0.8y * y = 40

Multiply y * y
0.8y2 = 40

Solving
0.8y2 = 40

Solving for variable 'y'.

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

Divide each side by '0.8'.
y2 = 50

Simplifying
y2 = 50

Take the square root of each side:
y = {-7.071067812, 7.071067812}

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