Question

i am having trouble solving this, i had solved this question easily but now i forgot pls help​

Answer 1

Answer:

6 (a^2 - b^2)

Step-by-step explanation:

(7/2a - 5/2b)^2 - (5/2a -7/2b)^2

(49/4a^2 + 25/4b^2 - 70/4ab) - (25/4a^2 + 49/4b^2 - 70/4ab)

24/4a^2 - 24/4b^2

24/4 (a^2 - b^2)

6 (a^2 - b^2)