If a - b = 13 and
a2 + b2 = 197,
then the value of ab is:
Answer & explanation
Correct answer: option 3
Given,
a - b = 13
a2 + b2 = 197
( a - b )2 = a2 + b2 - 2ab
169 = 197 - 2ab
ab = 14
If a - b = 13 and
a2 + b2 = 197,
then the value of ab is:
Correct answer: option 3
Given,
a - b = 13
a2 + b2 = 197
( a - b )2 = a2 + b2 - 2ab
169 = 197 - 2ab
ab = 14