(fg)(x)=(5x+4)(4x-5)

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


Simplifying
(fg)(x) = (5x + 4)(4x + -5)

Multiply fg * x
fgx = (5x + 4)(4x + -5)

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

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

Multiply (4 + 5x) * (-5 + 4x)
fgx = (4(-5 + 4x) + 5x * (-5 + 4x))
fgx = ((-5 * 4 + 4x * 4) + 5x * (-5 + 4x))
fgx = ((-20 + 16x) + 5x * (-5 + 4x))
fgx = (-20 + 16x + (-5 * 5x + 4x * 5x))
fgx = (-20 + 16x + (-25x + 20x2))

Combine like terms: 16x + -25x = -9x
fgx = (-20 + -9x + 20x2)

Solving
fgx = -20 + -9x + 20x2

Solving for variable 'f'.

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

Divide each side by 'gx'.
f = -20g-1x-1 + -9g-1 + 20g-1x

Simplifying
f = -20g-1x-1 + -9g-1 + 20g-1x

Reorder the terms:
f = -9g-1 + -20g-1x-1 + 20g-1x

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