Question

87×93 evaluate (identities)

Answer 1

(a+b)2=(a)2+2(a)(b)+(b)2
(90-3)2×(90+3)2
(90)2-2(90)(3)+(3)2×(90)2+2(90)(3)+(3)2
(8100-540+9)(8100+540+9)
7569×8649=65464281.

Answer 2

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