How to solve this?
pls
(7/9a +9/7b)² -ab

Step-by-step explanation:

(7/9a+9/7b)^2 -ab

simplifying (7/9a+9/7b)^2

expanding the bracket

factorizing b out

49/81a^2 +98/63ab +b(b-a)

the l.c.m= (81a^2) (63ab)

multiplying through by the L.C.M

63ab×49 +98×81a^2 +b(b-a) ×81a^2 ×63ab

... the app is not working anymore

=

just do 5.2 + 2 ( 7.2) and 1/3 x 3 (.9) and youv'e got your equation. 0.9( 9/10) + 7.2 ^2 = 16.4 hope i could !

step-by-step explanation:

this is false ^.^ lol