If a - b = 4 and
a2 + b2 = 40,
then the value of ab is:
Answer & explanation
Correct answer: option 3
Given,
a - b = 4
a2 + b2 = 40
( a - b )2 = a2 + b2 - 2ab
16 = 40 - 2ab
ab = 12
If a - b = 4 and
a2 + b2 = 40,
then the value of ab is:
Correct answer: option 3
Given,
a - b = 4
a2 + b2 = 40
( a - b )2 = a2 + b2 - 2ab
16 = 40 - 2ab
ab = 12