Question

multiply using identities. (5a+7b)(5a-7b)
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Answer 1

$\sf\colorbox{pink}{⇨ AnsweR ⇦}$

$(5a + 7b)(5a - 7b) \\ \\ using \: identity \\ \\ {a}^{2} - {b}^{2} \\ \\ = (a + b)(a - b) \\ \\ here \: a\: = 5a \: \\ and \: b \: = 7b \\ \\ so \: (5a + 7b)(5a - 7b) \\ \\ = {(5a)}^{2} - {(7b)}^{2} \\ \\ = 25a^2 - 49b^2$

⍆ hope this much helps uh ⍅

Answer 2

Answer:

25a*2-45b*2

Step-by-step explanation:

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

(5a)*2-(7b)*2

25a*2-49b*2