f(x)=-(x+3)(x+1)(x-2)

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Solution for f(x)=-(x+3)(x+1)(x-2) equation:


Simplifying
f(x) = -1(x + 3)(x + 1)(x + -2)

Multiply f * x
fx = -1(x + 3)(x + 1)(x + -2)

Reorder the terms:
fx = -1(3 + x)(x + 1)(x + -2)

Reorder the terms:
fx = -1(3 + x)(1 + x)(x + -2)

Reorder the terms:
fx = -1(3 + x)(1 + x)(-2 + x)

Multiply (3 + x) * (1 + x)
fx = -1(3(1 + x) + x(1 + x))(-2 + x)
fx = -1((1 * 3 + x * 3) + x(1 + x))(-2 + x)
fx = -1((3 + 3x) + x(1 + x))(-2 + x)
fx = -1(3 + 3x + (1 * x + x * x))(-2 + x)
fx = -1(3 + 3x + (1x + x2))(-2 + x)

Combine like terms: 3x + 1x = 4x
fx = -1(3 + 4x + x2)(-2 + x)

Multiply (3 + 4x + x2) * (-2 + x)
fx = -1(3(-2 + x) + 4x * (-2 + x) + x2(-2 + x))
fx = -1((-2 * 3 + x * 3) + 4x * (-2 + x) + x2(-2 + x))
fx = -1((-6 + 3x) + 4x * (-2 + x) + x2(-2 + x))
fx = -1(-6 + 3x + (-2 * 4x + x * 4x) + x2(-2 + x))
fx = -1(-6 + 3x + (-8x + 4x2) + x2(-2 + x))
fx = -1(-6 + 3x + -8x + 4x2 + (-2 * x2 + x * x2))
fx = -1(-6 + 3x + -8x + 4x2 + (-2x2 + x3))

Combine like terms: 3x + -8x = -5x
fx = -1(-6 + -5x + 4x2 + -2x2 + x3)

Combine like terms: 4x2 + -2x2 = 2x2
fx = -1(-6 + -5x + 2x2 + x3)
fx = (-6 * -1 + -5x * -1 + 2x2 * -1 + x3 * -1)
fx = (6 + 5x + -2x2 + -1x3)

Solving
fx = 6 + 5x + -2x2 + -1x3

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 6x-1 + 5 + -2x + -1x2

Simplifying
f = 6x-1 + 5 + -2x + -1x2

Reorder the terms:
f = 5 + 6x-1 + -2x + -1x2

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