If a + b = 10 and ab = 9, then the value of a – b is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 8
According to the question
[a – b]2 = [a + b]2 - 4 ab
[a – b]2 = 100 - 4 × 9 = 100 - 36 = 64
a – b = 8
SSC CPO 2022 PYQ — Question 123
SSC CPO - 11 Nov 2022 - Shift 1 • Quantitative Aptitude • Q123