Subject Category > Mathematics

Q. If a + b = 10 and ab = 21, then the value of (a - b)2 is

A) 16

B) 15

C) 18

D) 17

16

Additional Information > Exam point of View

We know that (a + b)² = a² + b² + 2ab. Substituting the given values, 10² = a² + b² + 2(21). Solving, 100 = a² + b² + 42, so a² + b² = 58.
Open this in:
tutorliv App Icon
TutorliV App
Browser Icon
Browser

Get the universal app

Download lessons and learn anytime, anywhere with the TutorLiv app.

TutorLiv App Preview

Find Teachers, Institutes & Coaching Centers Profiles, Articles, & Test Series