Question

Solve this by (a+b)(a-b).
(21+29)(21-29)

Answer 1

$(a) { }^{2} - (b) ^{2}$

Answer 2

(a+b)(a-b)=a^2-b^2
therefore..
(21+29)(21-29)=

21^2-29^2=

441-841=

-400...

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