Factorise 1.a2+10a+24
2.a2-3a-40
3.1-2a-3a2
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a2+10a+24
a2+(6+4)a+24
(a2+6a)+(4a+24)
a(a+6)+4(a+6)
(a+6)(a+4)
a= -6 a= -4
a2+(6+4)a+24
(a2+6a)+(4a+24)
a(a+6)+4(a+6)
(a+6)(a+4)
a= -6 a= -4
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