the polynomial x^3+2x^2-5ax-7 and x^3+ax^2- 12x + 6 when divided by x+1 and x-2 respectively , leave reminder r1 and r2 respectively. find the value of a in each of the following cases :
1. r1 = r2
2.r1 = r2 = 0
3. 2r1+ r2 =0
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3rd case
I don't know
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