CBSE Class 8CBSE
Share
Notifications

View all notifications

Using (X + A) (X + B) = Xsquare2 + (A + B) X + Ab, Find 9.7 × 9.8 - CBSE Class 8 - Mathematics

Login
Create free account


      Forgot password?

Question

Using (x + a) (x + b) = x2 + (a + b) x + ab, find 9.7 × 9.8

Solution

9.7 × 9.8 = (10 − 0.3) (10 − 0.2)

= (10)2 + [(− 0.3) + (− 0.2)] (10) + (− 0.3) (− 0.2)

= 100 + (− 0.5)10 + 0.06 = 100.06 − 5 = 95.06

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 8 (2018 to Current)
Chapter 9: Algebraic Expressions and Identities
Ex. 9.50 | Q: 8.4 | Page no. 152

Video TutorialsVIEW ALL [1]

Solution Using (X + A) (X + B) = Xsquare2 + (A + B) X + Ab, Find 9.7 × 9.8 Concept: Standard Identities.
S
View in app×