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12 March, 13:30

How do we do the following equation.

3x^2+28x+9=0

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Answers (1)
  1. 12 March, 16:24
    0
    Use ac methd

    in form ax²+bx+c=0

    to factor

    1. multiply a and c

    2. what does that result factor to to add to b?

    3. split up b to make those facotrs

    4. group

    5. undistribute 2 times

    3x²+28x+9=0

    3 times 9=27

    what 2 numbers multily to 27 and add to 28?

    1 and 27

    3x²+1x+27x+9=0

    (3x²+1x) + (27x+9) = 0

    x (3x+1) + 9 (3x+1) = 0

    (3x+1) (x+9) = 0

    set to zero

    3x+1=0

    3x=-1

    x=-1/3

    x+9=0

    x=-9

    x=-1/3 or - 9
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