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Buster
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Buster asked in Science & MathematicsMathematics · 10 years ago

Need help with this algebra question:?

-4a^3 + 12a^2 + 40a Factor. My anwser is -4(a-5)a(a+2). Please show me how to solve.

1 Answer

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  • Anonymous
    10 years ago

    First, in the original equation, divide by a common denominator: -4a

    This gives you a^2 - 3a - 10

    You can either use the quadratic formula here, or you can factor it out yourself. If you factor it yourself, you come up with:

    (x - 5)(x + 2)

    Then, you set each quantity = 0

    x-5 = 0

    and

    x+2 = 0

    This gives your answers to be x= -2, 5

    Hope this helps!

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