If a - b = 3 and
a2 + b2 = 485,
then the value of ab is:
Answer & explanation
Correct answer: option 4
Given,
a - b = 3
a2 + b2 = 485
( a - b )2 = a2 + b2 - 2ab
9 = 485 - 2ab
ab = 238
If a - b = 3 and
a2 + b2 = 485,
then the value of ab is:
Correct answer: option 4
Given,
a - b = 3
a2 + b2 = 485
( a - b )2 = a2 + b2 - 2ab
9 = 485 - 2ab
ab = 238