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28 ) Find the value of a", "show that (z+1) and (2-1) are factors z' + az + 22 -32+b |
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Answer» If these are factors hence put z=1 and z=-1he CE(1)^4+a(1)^3+2(1)^2-3(1)+b=01+a+2-3+b=0a+b=0and(-1)^4+a(-1)^3+2(-1)^2-3(-1)+b=01-a+2+3+b=0a-b=6adding both the equationshence2a=6a=3andb=-3 |
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