Question

(7a-4b)(7a-4b) using identities

Answer 1

Answer:

using the identity : (a-b)^2

Explanation:

so, (7a-4b)^2

=7a^2-2(7a)(4b)+4b^2

=49a^2-56ab+16b^2

Answer 2

Explanation:

(7a-4b)(8a-4b)

we know that (a-b)(a-b)=(a-b)²=a²+b²-2ab

so,lets come to solution

(7a-4b)²

(7a)²+(4b)²-2*7a*4b

49a²+16b²-56ab

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