Practicing Success
CUET Preparation Today
CUET
General Test
Quantitative Reasoning
Algebra
If a - b = 7 and
a2 + b2 = 85,
then the value of ab is:
48
20
14
18
Given,
a - b = 7
a2 + b2 = 85
( a - b )2 = a2 + b2 - 2ab
49 = 85 - 2ab
ab = 18