Question

4. Factorise :
(i) 12x2 - 7x+1​

Answer 1

Step-by-step explanation:

12x² - 7x + 1

12x² - 4x - 3x + 1

4x( 3x -1) - 1( 3x - 1)

(4x - 1) ( 3x - 1) answer

Answer 2

12x2 - 7x + 1

{12×1=12. So 12 should be

divided into 2 numbers such

that their product is

12 and difference/sum is -7.

Therefore 12 is divided into -4 and -3}

Solution-

12x2-4x-3x+1

(12x2-4x)-(3x-1)

{Factorisation by grouping of terms}

4x(3x-1)-1(3x-1)

=(3x-1) (4x-1)