Question

expand (5a-7b) by using identities
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Answer 1

Answer:

5 x a - 7 x b is the answer

Explanation:

(5a-7b) means 5 x a - 7 x b (x means multiplied by )

Answer 2

Answer:

If you are saying that using identities then it should be (5a-7b)²

Explanation:

Now using the formula:-

( x-y )² = x² - 2xy + y²

( 5a-7b) = (5a) ² - 2(5a)(7b) + (7b) ²

= 25a² - 70ab + 49b²