a + b = 9m এবং ab = 18 m2 হলে a - b এর মান কত ?
Correct Answer: Option C
(a - b )2 = (a + b )2 - 4ab
= (9m)2 - 4.18 m2
= 81 m2 - 72 m2
(a - b )2 = 9 m2
a - b = \(\sqrt {9{m^2}} \) a - b = \( \pm \) 3m
Download our app for free and access thousands of MCQ questions with detailed solutions