Question

factorise : 7(3a - b)² - 28(2a - b)²​

Answer 1

Answer:

7×9asquare-7bsquare - 28×4asquare-28bsquare

so ,

63a square - 7b square- 112a square- 28 b square

put the value of a is one side and b is other

then,63a square - 112a square - 7b square - 28 b square

-49 a square - 21 b square

so answer is 49 a square +21 b square

because -,- Singh change in plus

I hope it's helpful for you

please mark me briantlist please..........

Answer 2

Answer:

Hii ....

Step-by-step explanation:

Bhul gaya mujhe...