Question

If x-y is 12 cm and xy is 25/4 find x+y

Answer 1

we have given that

x-y=12 and xy=25/4

we have to find

x+y =?

solution:-

we know that

(x+y)² = (x-y)²+4xy

here

(x+y)² = 12² + 4×25/4

=> 144 +25 = 169

=> x+y = √169 = 13 is the answer