Question

Evalute : `( 7/8x + 4/5y)^2`

Answer 1

`( 7/8x + 4/5y)^2`

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

∴ `( 7/8x + 4/5y)^2` 

= `(7/8x)^2 + (4/5y)^2 + 2 xx 7/8x xx 4/5y`

= `(49x^2)/(64) + (16y^2)/25 + (7xy)/5`