4. Factorise :
(1) 12xsquare - 7x+1
(ii) 2x square+ 7x +3
(iv) 3x square – x-4
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4. Factorise :
(1) 12xsquare - 7x+1
(ii) 2x square+ 7x +3
(iv) 3x square – x-4
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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
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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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