Question

(7/9a + 9/7b)² -ab simplify

Answer 1

use the formula of ( a+b )² = a²+b²+2ab
here.
a : 7/9 a
b :9/7 b
using it
(7/9 a +9/7 b)²=
49/81a²+81/49b²+(2*7/9a*9/7 b) 2ab
now putting - ab in the statement
49/81a²+81/49b² +ab(2 ab - ab )
ans. : 49/81a² +81/49 b² + ab

Answer 2

Answer:

This is the correct answer... hope it helps you..