Question

if sum of two numbers is 2 and their product is --15 then their difference is
Options
A. 5
B.8
C.--13
D.7​

Answer 1

Answer:

Step-by-step explanation:

Gn.: x+y=2-------(1)

xy= -15

==> x= -15/y in (1)

(1)===> -15/y+y=2

===> -15+y^2=2y

===> y^2 -2y -15=0

===> y^2-5y+3y-15=0

===> y (y-5) + 3 (y-5)=0

===> y= -3 and y= 5

Therefore x=2-y

====> x = 2-(-3)

====> x = 2+3=5

Hence difference between them is x-y = 5-(-3)=8