Question

4. Factorise :
(1) 12xsquare - 7x+1

(ii) 2x square+ 7x +3
(iv) 3x square – x-4​

Answer 1

Step-by-step explanation:

(I) 12x2-7x+1

12x2-4x-3x+1

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

4x-1=0. 3x-1=0

x=1/4. x=1/3

(2)2x2+7x+3

2x2+6x+x+3

2x(x+3)+1(x+3)

(2x+1)(x+3)

2x+1=0. x+3=0

x=-1/2. x=-3

(3)3x2-x-4

3x2-4x+3x-4

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

x+1=0. 3x-4=0

x=-1. x=4/3

Answer 2

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1) 12x²-4x-3x+1

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

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

2) 2x²+7x+3=2x²+6x+x+3

= 2x(x+3)+1(x+3)

= (x+3)(2x+1)

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