f(x)=(3x+7)(4x+1)

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Solution for f(x)=(3x+7)(4x+1) equation:


Simplifying
f(x) = (3x + 7)(4x + 1)

Multiply f * x
fx = (3x + 7)(4x + 1)

Reorder the terms:
fx = (7 + 3x)(4x + 1)

Reorder the terms:
fx = (7 + 3x)(1 + 4x)

Multiply (7 + 3x) * (1 + 4x)
fx = (7(1 + 4x) + 3x * (1 + 4x))
fx = ((1 * 7 + 4x * 7) + 3x * (1 + 4x))
fx = ((7 + 28x) + 3x * (1 + 4x))
fx = (7 + 28x + (1 * 3x + 4x * 3x))
fx = (7 + 28x + (3x + 12x2))

Combine like terms: 28x + 3x = 31x
fx = (7 + 31x + 12x2)

Solving
fx = 7 + 31x + 12x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 7x-1 + 31 + 12x

Simplifying
f = 7x-1 + 31 + 12x

Reorder the terms:
f = 31 + 7x-1 + 12x

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