(3r^2+3r-8)(5-2r)=

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Solution for (3r^2+3r-8)(5-2r)= equation: 


Simplifying
(3r2 + 3r + -8)(5 + -2r) = 0

Reorder the terms:
(-8 + 3r + 3r2)(5 + -2r) = 0

Multiply (-8 + 3r + 3r2) * (5 + -2r)
(-8(5 + -2r) + 3r * (5 + -2r) + 3r2 * (5 + -2r)) = 0
((5 * -8 + -2r * -8) + 3r * (5 + -2r) + 3r2 * (5 + -2r)) = 0
((-40 + 16r) + 3r * (5 + -2r) + 3r2 * (5 + -2r)) = 0
(-40 + 16r + (5 * 3r + -2r * 3r) + 3r2 * (5 + -2r)) = 0
(-40 + 16r + (15r + -6r2) + 3r2 * (5 + -2r)) = 0
(-40 + 16r + 15r + -6r2 + (5 * 3r2 + -2r * 3r2)) = 0
(-40 + 16r + 15r + -6r2 + (15r2 + -6r3)) = 0

Combine like terms: 16r + 15r = 31r
(-40 + 31r + -6r2 + 15r2 + -6r3) = 0

Combine like terms: -6r2 + 15r2 = 9r2
(-40 + 31r + 9r2 + -6r3) = 0

Solving
-40 + 31r + 9r2 + -6r3 = 0

Solving for variable 'r'.

The solution to this equation could not be determined.

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