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2 March, 02:15

Completely factor 6a^2 - 8a - 30

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  1. 2 March, 02:44
    0
    Factor out 2

    2 (3a^2-4a-15)

    hmm

    trial and error

    nope

    fancy I-forgot-the-name way

    multiply 3 and - 15 to get - 45

    find y and t such that yt=-45 and y+t=-4

    tricky

    hmm

    -9 and 5

    split - 4a into - 9a and 5a

    2 (3a^2-9a+5a-15)

    split and factor

    2[ (3a^2-9a) + (5a-15) ]

    factor oout common factors

    2[3a (a-3) + 5 (a-3) ]

    epic reverse distribute, remmber ab+ac=a (b+c) the (a-3) is theh a part

    2[ (a-3) (3a+5) ]

    something

    (2) (a-3) (3a+5)

    (2) (3a+5) (a-3) is factored form
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