f(x)=-3(x-4)(x+5)

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Solution for f(x)=-3(x-4)(x+5) equation:


Simplifying
f(x) = -3(x + -4)(x + 5)

Multiply f * x
fx = -3(x + -4)(x + 5)

Reorder the terms:
fx = -3(-4 + x)(x + 5)

Reorder the terms:
fx = -3(-4 + x)(5 + x)

Multiply (-4 + x) * (5 + x)
fx = -3(-4(5 + x) + x(5 + x))
fx = -3((5 * -4 + x * -4) + x(5 + x))
fx = -3((-20 + -4x) + x(5 + x))
fx = -3(-20 + -4x + (5 * x + x * x))
fx = -3(-20 + -4x + (5x + x2))

Combine like terms: -4x + 5x = 1x
fx = -3(-20 + 1x + x2)
fx = (-20 * -3 + 1x * -3 + x2 * -3)
fx = (60 + -3x + -3x2)

Solving
fx = 60 + -3x + -3x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 60x-1 + -3 + -3x

Simplifying
f = 60x-1 + -3 + -3x

Reorder the terms:
f = -3 + 60x-1 + -3x

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