If A2 + B2 = 41 and Ab = 4, Find : a + B - Mathematics

Advertisement Remove all ads
Sum

If a2 + b2 = 41 and ab = 4, find : a + b

Advertisement Remove all ads

Solution

(a + b)2 = a2 + b2 + 2ab

= 41 + 2(4)

= 41 +  8

= 49

⇒ (a + b)2 = 49

∴ a + b = 7

Concept: Important Formula of Expansion
  Is there an error in this question or solution?

APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (D) | Q 6.2 | Page 155
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×