f(x)=-0.2(x+5)(x-5)

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Solution for f(x)=-0.2(x+5)(x-5) equation: 


Simplifying
f(x) = -0.2(x + 5)(x + -5)

Multiply f * x
fx = -0.2(x + 5)(x + -5)

Reorder the terms:
fx = -0.2(5 + x)(x + -5)

Reorder the terms:
fx = -0.2(5 + x)(-5 + x)

Multiply (5 + x) * (-5 + x)
fx = -0.2(5(-5 + x) + x(-5 + x))
fx = -0.2((-5 * 5 + x * 5) + x(-5 + x))
fx = -0.2((-25 + 5x) + x(-5 + x))
fx = -0.2(-25 + 5x + (-5 * x + x * x))
fx = -0.2(-25 + 5x + (-5x + x2))

Combine like terms: 5x + -5x = 0
fx = -0.2(-25 + 0 + x2)
fx = -0.2(-25 + x2)
fx = (-25 * -0.2 + x2 * -0.2)
fx = (5 + -0.2x2)

Solving
fx = 5 + -0.2x2

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 5x-1 + -0.2x

Simplifying
f = 5x-1 + -0.2x

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