(u^2-6u-7)(5u+20)=0

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Solution for (u^2-6u-7)(5u+20)=0 equation: 


Simplifying
(u2 + -6u + -7)(5u + 20) = 0

Reorder the terms:
(-7 + -6u + u2)(5u + 20) = 0

Reorder the terms:
(-7 + -6u + u2)(20 + 5u) = 0

Multiply (-7 + -6u + u2) * (20 + 5u)
(-7(20 + 5u) + -6u * (20 + 5u) + u2(20 + 5u)) = 0
((20 * -7 + 5u * -7) + -6u * (20 + 5u) + u2(20 + 5u)) = 0
((-140 + -35u) + -6u * (20 + 5u) + u2(20 + 5u)) = 0
(-140 + -35u + (20 * -6u + 5u * -6u) + u2(20 + 5u)) = 0
(-140 + -35u + (-120u + -30u2) + u2(20 + 5u)) = 0
(-140 + -35u + -120u + -30u2 + (20 * u2 + 5u * u2)) = 0
(-140 + -35u + -120u + -30u2 + (20u2 + 5u3)) = 0

Combine like terms: -35u + -120u = -155u
(-140 + -155u + -30u2 + 20u2 + 5u3) = 0

Combine like terms: -30u2 + 20u2 = -10u2
(-140 + -155u + -10u2 + 5u3) = 0

Solving
-140 + -155u + -10u2 + 5u3 = 0

Solving for variable 'u'.

Factor out the Greatest Common Factor (GCF), '5'.
5(-28 + -31u + -2u2 + u3) = 0

Ignore the factor 5.

Subproblem 1
Set the factor '(-28 + -31u + -2u2 + u3)' equal to zero and attempt to solve:

Simplifying
-28 + -31u + -2u2 + u3 = 0

Solving
-28 + -31u + -2u2 + u3 = 0

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.

The solution to this equation could not be determined.

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