F(X)=(0.5X-4)(0.2X+1)

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Solution for F(X)=(0.5X-4)(0.2X+1) equation: 


Simplifying
F(X) = (0.5X + -4)(0.2X + 1)

Multiply F * X
FX = (0.5X + -4)(0.2X + 1)

Reorder the terms:
FX = (-4 + 0.5X)(0.2X + 1)

Reorder the terms:
FX = (-4 + 0.5X)(1 + 0.2X)

Multiply (-4 + 0.5X) * (1 + 0.2X)
FX = (-4(1 + 0.2X) + 0.5X * (1 + 0.2X))
FX = ((1 * -4 + 0.2X * -4) + 0.5X * (1 + 0.2X))
FX = ((-4 + -0.8X) + 0.5X * (1 + 0.2X))
FX = (-4 + -0.8X + (1 * 0.5X + 0.2X * 0.5X))
FX = (-4 + -0.8X + (0.5X + 0.1X2))

Combine like terms: -0.8X + 0.5X = -0.3X
FX = (-4 + -0.3X + 0.1X2)

Solving
FX = -4 + -0.3X + 0.1X2

Solving for variable 'F'.

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

Divide each side by 'X'.
F = -4X-1 + -0.3 + 0.1X

Simplifying
F = -4X-1 + -0.3 + 0.1X

Reorder the terms:
F = -0.3 + -4X-1 + 0.1X

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