Question

Example 4: (1) Show that =
(4/5x+5/4y)^2-(4/5x-5/4y)^2=4xy

Answer 1

Answer:

4xy

Step-by-step explanation:

(4/5x+5/4y)^2-(4/5x+5/4y)^2=4xy

16/25x+25/16y-16/25x+25/16y=4xy

By cross multiplication,

16(16y)+25(25y)-16(16y)+25(25x)=4xy

256y+625y-256y+625x=4xy

=>4xy

HOPE IT'S HELPFUL