Question

find the following square using appreciate identity (c/5+d/7)²​

Answer 1

Step-by-step explanation:

c/5+d/7=(7c+5d/35)²

7²c²+5²d²+2*7c*5d/35²

49c²25d²+70cd/1225

Answer 2

Step-by-step explanation:

(c/5+d/7)^2

(a+b)^2=a^2+b^2+2ab

I. e.

c^2/25+d^2/49+2cd

lcm of 25 and 49 is 1225

49c^2+25d^2+2250cd/1225

the answer would be

c^2/25+d^2/49+2cd or

49c^2+25d^2+2250cd/1225

both are correct