Q13 of 19 Page 59

Factorise.

(1) 2 y2 - 11 y + 5


(2) x2 - 2 x - 80


(3) 3 x2 -4 × + 1


(1) 2 y2 - 11 y + 5


= 2 y2 - 10y -1y +5


= 2y(y-5)-1(y-5)


= (y-5)(2y-1)


(2) x2 - 2 x – 80


= x2 - 10x +8x -80


= x(x-10)+ 8(x-10)


= (x - 10)(x+8)


(3) 3 x2 -4 x + 1


= 3 x2 – 3x – x +1


= 3×(x-1) -1(x -1)


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


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