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9th grade

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Multiplying Binomials

(b-6)*(b+3)

  • 9th grade -

    (b-6)(b+3)

    use FOIL:
    b*b
    b*3
    -6*b
    -6*3

    add them together to get:
    b^2 - 3b - 18

  • 9th grade -

    You distribute the first set of brackets.
    When you have equations like this you should pretend there are no brackets around the first equation.
    b-6 (b+3)
    first you distribute b into the brackets.
    (b)(b) = b^2
    then b to 3
    (b)(3) = 3b
    then you distribute the -6 to both...
    (-6)(b) = -6b
    then -6 to 3...
    (-6)(3) = -18

    then you add them together...
    b^2-3b-18

    :)

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