Factorise the following expressions by splitting the middle term.
1. a-9a + 14
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a= 7
a-9a+14 =0
a -7a + 2a + 14 =0
a (a-7) +2 (a-7) =0 we taken (a-7 ) common
( a -7) (a +2 ) =0
then
a -7 =0 ; a + 2 =0
a = 7 ; a = -2
therefore : a = 7
neglect negative value
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