Question

Using the identity, evaluate the following
(79)²- (69)²​

Answer 1

Answer:

multiply 79 two times and 69 tow times then minus you get yr ans

Answer 2

Answer:

$\\ ( {79}^{2} ) - ({69})^{2} \\ = (79 + 69)(79 - 69) \\ = 148 \times 10 \\ = 1480$

By using

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

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