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How do you find the solution to the quadratic equation #- x^3 - x^2 + 21x + 45=0#?

1 Answer

May 5, 2015

Let's solve your equation step-by-step.

#−x^3−x^2+21x+45=0#

Step 1: Factor left side of equation.

#(−x−3)(x+3)(x−5)=0#

Step 2: Set factors equal to 0.

#−x−3=0 or x+3=0 or x−5=0#
#x=−3 or x=−3 or x=5#

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