CBSE Class 8CBSE
Share
Notifications

View all notifications

Factorisation - Method of Common Factors

Login
Create free account


      Forgot password?

notes

 We begin with a simple example: Factorise 2x + 4. 
We shall write each term as a product of irreducible factors;
`2x = 2 × x `
4 = 2 × 2 
Hence `2x + 4 = (2 × x) + (2 × 2)` 
The factor 2 is common to both the terms. 
Observe, by distributive law
`2 × (x + 2) = (2 × x) + (2 × 2)`
Therefore, we can write
`2x + 4 = 2 × (x + 2) = 2 (x + 2) `
Thus, the expression 2x + 4 is the same as 2 (x + 2).  Now we can read off its factors: they are 2 and (x + 2). These factors are irreducible. 

Shaalaa.com | Method of common factors

Shaalaa.com


Next video


Shaalaa.com


Method of common factors [00:05:43]
S
Series 1: playing of 1
0%


S
View in app×