Question

(a) a+b = 8 and ab = 15​

Answer 1

Answer:

3 or 5

Step-by-step explanation:

a+b=8

or, a=b-8... eq 1

ab=15.... eq 2

combining eq 1 and 2,we get,

(8-b) b=15

8b-b^2=15

b^2-8b+15=0

b^2-5b-3b+15=0

b(b-5) -3(b-5) =0

(b-3) (b-5) =0

either, b-3=O

b=3

or, b-5=0

b=5