Factorise :
(i) 9y2 + 81y + y + 9
(iv) x2 + x - 20
(vii) x2 - 11x - 60
(x) x2 - 11x + 28
(xiii) x2 - 8x + 15
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Answer:
Step-by-step explanation:
1.....9y²+81y+y+9
=> 9y(y+9)+1(y+9)
=> (9y+1) (y+9)
2....x²+x-20
=> x²+5x-4x-20
=> x(x+5)-4(x+5)
=> (x+5) (x-4)
3.....x²-11x-60
=> x²-15x+4x-60
=> x(x-15)+4(x-15)
=> (x-15) (x+4)
4......x²-11x+28
=> x²-7x-4x+28
=> x(x-7)-4(x-7)
=> (x-7) (x-4)
5......x²-8x+15
=> x²-5x-3x+15
=> x(x-5)-3(x-5)
=> (x-5) (x-3)
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