SSC (English Medium) Class 8Maharashtra State Board
Share
Notifications

View all notifications

Expand. (7m − 3n − 4k)2 - SSC (English Medium) Class 8 - Mathematics

Login
Create free account


      Forgot password?

Question

Expand.

(7m − 3n − 4k)2

Solution

It is known that,

\[\left( a + b + c \right)^2  =  a^2  +  b^2  +  c^2  + 2ab + 2bc + 2ca\]

\[\   \left( 7m - 3n - 4k \right)^2 \] 

\[ =  \left( 7m \right)^2  + \left( - 3 n^2 \right) +  \left( - 4k \right)^2  + 2 \times 7m \times \left( - 3n \right) + 2 \times \left( - 3n \right) \times \left( - 4k \right) + 2 \times \left( - 4k \right) \times 7m\] \[ = 49 m^2  + 9 n^2  + 16 k^2  - 42mn + 24nk - 56km\]

  Is there an error in this question or solution?

APPEARS IN

 Balbharati Solution for Balbharati Class 8 Mathematics (2019 to Current)
Chapter 5: Expansion formulae
Practice Set 5.4 | Q: 1.4 | Page no. 28
Solution Expand. (7m − 3n − 4k)2 Concept: Expansion of (A + B + C)2.
S
View in app×