Question

If x + y = 5 and xy =10 , find the values of :
(i) x-y
(ii) -5x2 + y2)
N​

Answer 1

Answer:

1)since (x-y)2= (x+y)2-4xy

(x-y )2=5^2-4×10

(x-y)2 =25-40

(x-y)2-15

x-y=√-15