simplify (-8y^2+6y-1)+(-8y^2+8y+1)(-3y^2+9y-9)

Question

simplify
(-8y^2+6y-1)+(-8y^2+8y+1)(-3y^2+9y-9)

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Josephine 1 week 2021-10-04T05:21:53+00:00 1 Answer 0

Answers ( )

    0
    2021-10-04T05:22:55+00:00

    Answer:

    24y^4-96y^3+133y^2-57y-10

    Step-by-step explanation:

    Given expression

    (-8y^2+6y-1)+(-8y^2+8y+1)(-3y^2+9y-9)

    First, multiply two polynomials in brackets:

    (-8y^2+8y+1)(-3y^2+9y-9)\\ \\=24y^4-72y^3+72y^2-24y^3+72y^2-72y-3y^2+9y-9\\ \\=24y^4-96y^3+141y^2-63y-9

    No add two polynomials:

    -8y^2+6y-1+24y^4-96y^3+141y^2-63y-9\\ \\=24y^4-96y^3+133y^2-57y-10

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