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

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


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

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

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

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

Multiply (5 + 3x) * (-4 + x)
fx = (5(-4 + x) + 3x * (-4 + x))
fx = ((-4 * 5 + x * 5) + 3x * (-4 + x))
fx = ((-20 + 5x) + 3x * (-4 + x))
fx = (-20 + 5x + (-4 * 3x + x * 3x))
fx = (-20 + 5x + (-12x + 3x2))

Combine like terms: 5x + -12x = -7x
fx = (-20 + -7x + 3x2)

Solving
fx = -20 + -7x + 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 = -20x-1 + -7 + 3x

Simplifying
f = -20x-1 + -7 + 3x

Reorder the terms:
f = -7 + -20x-1 + 3x

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