y=3x*(-x)

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Solution for y=3x*(-x) equation: 


Simplifying
y = 3x(-1x)

Remove parenthesis around (-1x)
y = 3x * -1x

Reorder the terms for easier multiplication:
y = 3 * -1x * x

Multiply 3 * -1
y = -3x * x

Multiply x * x
y = -3x2

Solving
y = -3x2

Solving for variable 'y'.

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

Simplifying
y = -3x2

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