Question

If x + y = 10 and xy = 5 then the value of
(A)
d
21
18
(B)
(D)
19
20

Answer 1

Answer:

x+y=10

x=10-y

put value of x in xy=5

(10-y)y=5

10y-y^2=5

y^2-10y=-5 (multiplied b/s by -)

y^2-10y+5 =o

now do it yourself self either spliting midle or by formula..