r(x)=-30(x-20)(x+2)

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Solution for r(x)=-30(x-20)(x+2) equation:


Simplifying
r(x) = -30(x + -20)(x + 2)

Multiply r * x
rx = -30(x + -20)(x + 2)

Reorder the terms:
rx = -30(-20 + x)(x + 2)

Reorder the terms:
rx = -30(-20 + x)(2 + x)

Multiply (-20 + x) * (2 + x)
rx = -30(-20(2 + x) + x(2 + x))
rx = -30((2 * -20 + x * -20) + x(2 + x))
rx = -30((-40 + -20x) + x(2 + x))
rx = -30(-40 + -20x + (2 * x + x * x))
rx = -30(-40 + -20x + (2x + x2))

Combine like terms: -20x + 2x = -18x
rx = -30(-40 + -18x + x2)
rx = (-40 * -30 + -18x * -30 + x2 * -30)
rx = (1200 + 540x + -30x2)

Solving
rx = 1200 + 540x + -30x2

Solving for variable 'r'.

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

Divide each side by 'x'.
r = 1200x-1 + 540 + -30x

Simplifying
r = 1200x-1 + 540 + -30x

Reorder the terms:
r = 540 + 1200x-1 + -30x

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