Hi I really need help with this question(It's my last one on this quiz)PLEASE HELP) 20 POINTS!!! Darius uses the polynomial identity (x-y)^2=x^2-2xy+y^2 to show that 9^2=81 what values can Darius use for x and y? A) x=81 and y=0 B)x=3 and y=6 C)x=11 and y=2 D)x=9 and y=81

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KageSamurai

High School

Hi I really need help with this question(It's my last one on this quiz)PLEASE HELP) 20 POINTS!!!

Darius uses the polynomial identity (x-y)^2=x^2-2xy+y^2 to show that 9^2=81
what values can Darius use for x and y?
A) x=81 and y=0
B)x=3 and y=6
C)x=11 and y=2
D)x=9 and y=81

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(Based on todays review)

hdjdjsjdj81

Answer:
C.) x = 11 and y = 2
$(x-y)^{2}=x^{2}-2xy+y^{2}\\(11-2)^{2}=(9)^2=81\\\\or\\(11-2)^2=(11)^2-2(11)(2)+(2)^2\\=121-44+4\\=81$
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