f(x)=(4x+2)(5x-1)

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Solution for f(x)=(4x+2)(5x-1) equation:


Simplifying
f(x) = (4x + 2)(5x + -1)

Multiply f * x
fx = (4x + 2)(5x + -1)

Reorder the terms:
fx = (2 + 4x)(5x + -1)

Reorder the terms:
fx = (2 + 4x)(-1 + 5x)

Multiply (2 + 4x) * (-1 + 5x)
fx = (2(-1 + 5x) + 4x * (-1 + 5x))
fx = ((-1 * 2 + 5x * 2) + 4x * (-1 + 5x))
fx = ((-2 + 10x) + 4x * (-1 + 5x))
fx = (-2 + 10x + (-1 * 4x + 5x * 4x))
fx = (-2 + 10x + (-4x + 20x2))

Combine like terms: 10x + -4x = 6x
fx = (-2 + 6x + 20x2)

Solving
fx = -2 + 6x + 20x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -2x-1 + 6 + 20x

Simplifying
f = -2x-1 + 6 + 20x

Reorder the terms:
f = 6 + -2x-1 + 20x

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