Question

find the following by using identity 2
(5a- 4b) ²​

Answer 1

(5a-4b)^2

25a^2+16b^2-40ab

Answer 2

Answer:

since (a-b)^2 = a^2 + b^2 - 2ab therefore

according to question :-

(5a-4b) ^2

(5a) ^2 + (4b) ^2 -2*5a*4b

25a^2 + 16b^2 -40ab

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