Question

$(13 - b) ^{2}$
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Answer 1

Answer:

(13 - b)²

(13)² -2(13)(b)+(b)²

169 -26b + b²

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Answer 2

Answer:

a^2-^2

2=(a+b)(a-b)248^2-

249^2=(248+249)(248-249)

=497(-1)

=-497