Question

expand polynomial 81-y^2​

Answer 1

-y²=-81

y²=81

y=9

.......

Answer 2

Answer:

(9+y)(9-y)

Step-by-step explanation:

81=9^2

so, on applying identity-(a+b)(a-b)=a^2-b^2

9^2-y^2

(9+y)(9-y)

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