b)
Factorise :25 (a,b)2 – 49 (a - b)2
Answers
Answered by
3
[5(a + b)]^2 - [7(a - b)]^2
[5a + 5b]^2 - [7a - 7b]^2
= [5a + 5b + 7a - 7b][5a + 5b - 7a + 7b]
= [12a - 2b][12b - 2a]
= 4[6a - b][6b - a]
[5a + 5b]^2 - [7a - 7b]^2
= [5a + 5b + 7a - 7b][5a + 5b - 7a + 7b]
= [12a - 2b][12b - 2a]
= 4[6a - b][6b - a]
Answered by
1
Answer:
above ans is correct..,.......
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