Question

If a -b = 2 and a^2 + b^2 = 20 , find the value of ab.

Answer 1

Step-by-step explanation:

a - b = 2

a = 2+b......(1)

a^2 +b^2 = 20

a^2 + b^2 = 20

(2+b) ^2 + b^2 = 20

4 +b^2 +4b +b^2 = 20

2b^2 +4b -16 = 0

-4 +/- √16 + 64/4

-4 +/- √80/4

-4 +4√20/4 or -4 - 4√20/4

-1 +√20 or -1 -√20 /4

Solve further and get your answer

Answer 2

Step-by-step explanation:

see attachment....

VALuE OF ab=8