Question

using the identity :(a-b) ²=a²-2ab+b² simplify the following a) (5x-4y) ²​

Answer 1

Answer:

hello mate

given question is (5x-4y) ²

we know

(a-b) ²=a²+b²-2ab

applying this to the question

(5x-4y) ²=(5x) ²+(-4y) ²-2×5x×4y

= 25x²+16y-100xy

Answer 2

Answer:

identity = (a-b)^2 = a^2+b^2-2ab

(5x-4y)^2 = (5x)^2 +(4y)^2-2(5x)(4y)

25x^2+16y^2-40xy