daisyrodriguez2154 daisyrodriguez2154

24-01-2021
Mathematics

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Your answer should be a polynomial in standard form.
(-r^2+ 3r– 7)(r^2– 7) =
PLEASE HELP !!

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darealmarinda123 darealmarinda123

24-01-2021

Answer:

-r^4+3r^3-21r+49

Step-by-step explanation:

(−r2+3r+−7)(r2+−7)

=(−r^2)(r^2)+(−r^2)(−7)+(3r)(r^2)+(3r)(−7)+(−7)(r^2)+(−7)(−7)

=−r4+7r2+3r3−21r−7r2+49

=−r4+3r3−21r+49

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