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1.x+1=0
X=-1
P(x)=4xcube+3xsquare-4x+k
=4*(1)cube+3*(1)square-4*1+k
=4*1+3*1-4+k
=4+3-4+k
=7-4+k
=3+k
-3=k
X=-1
P(x)=4xcube+3xsquare-4x+k
=4*(1)cube+3*(1)square-4*1+k
=4*1+3*1-4+k
=4+3-4+k
=7-4+k
=3+k
-3=k
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