Given the x+1 and x-2 are factors of 3x³+ax²+bx-2 find the value of a and of b
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put x= -1
-3+ a-b-2=0
a-b=5
put x= 2
24 + 4a + 2b -2=0
2a +b = -11
As a= 5+b
10 + 3b= -11
3b = -21
B= -7
A= -2
-3+ a-b-2=0
a-b=5
put x= 2
24 + 4a + 2b -2=0
2a +b = -11
As a= 5+b
10 + 3b= -11
3b = -21
B= -7
A= -2
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