f(3)f(x)=(8-3x)(x-2x-15)

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Solution for f(3)f(x)=(8-3x)(x-2x-15) equation: 


Simplifying
f(3) * f(x) = (8 + -3x)(x + -2x + -15)

Reorder the terms for easier multiplication:
3f * f * x = (8 + -3x)(x + -2x + -15)

Multiply f * f
3f2 * x = (8 + -3x)(x + -2x + -15)

Multiply f2 * x
3f2x = (8 + -3x)(x + -2x + -15)

Reorder the terms:
3f2x = (8 + -3x)(-15 + x + -2x)

Combine like terms: x + -2x = -1x
3f2x = (8 + -3x)(-15 + -1x)

Multiply (8 + -3x) * (-15 + -1x)
3f2x = (8(-15 + -1x) + -3x * (-15 + -1x))
3f2x = ((-15 * 8 + -1x * 8) + -3x * (-15 + -1x))
3f2x = ((-120 + -8x) + -3x * (-15 + -1x))
3f2x = (-120 + -8x + (-15 * -3x + -1x * -3x))
3f2x = (-120 + -8x + (45x + 3x2))

Combine like terms: -8x + 45x = 37x
3f2x = (-120 + 37x + 3x2)

Solving
3f2x = -120 + 37x + 3x2

Solving for variable 'f'.

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

Divide each side by '3x'.
f2 = -40x-1 + 12.33333333 + x

Simplifying
f2 = -40x-1 + 12.33333333 + x

Reorder the terms:
f2 = 12.33333333 + -40x-1 + x

Reorder the terms:
-12.33333333 + f2 + 40x-1 + -1x = 12.33333333 + -40x-1 + x + -12.33333333 + 40x-1 + -1x

Reorder the terms:
-12.33333333 + f2 + 40x-1 + -1x = 12.33333333 + -12.33333333 + -40x-1 + 40x-1 + x + -1x

Combine like terms: 12.33333333 + -12.33333333 = 0.00000000
-12.33333333 + f2 + 40x-1 + -1x = 0.00000000 + -40x-1 + 40x-1 + x + -1x
-12.33333333 + f2 + 40x-1 + -1x = -40x-1 + 40x-1 + x + -1x

Combine like terms: -40x-1 + 40x-1 = 0
-12.33333333 + f2 + 40x-1 + -1x = 0 + x + -1x
-12.33333333 + f2 + 40x-1 + -1x = x + -1x

Combine like terms: x + -1x = 0
-12.33333333 + f2 + 40x-1 + -1x = 0

The solution to this equation could not be determined.

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