Q4
If a - b = 3 and a2 + b2 = 29, find the value of ab.
A.
10
AnswerB.
12
C.
15
D.
18
E.
None of these
Answer: Option A
Solution
Answer: Option A
Solution:
2ab = (a2 + b2) - (a - b)22ab = 29 - 9
2ab = 20
∴ ab = 10