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Polynomial ring/Replacement/R to C/2x^3-5x^2-4x+7/2-5i/Exercise
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Evaluate the
polynomial
2
X
3
−
5
X
2
−
4
X
+
7
{\displaystyle 2X^{3}-5X^{2}-4X+7}
replacing the variable
X
{\displaystyle {}X}
by the
complex number
2
−
5
i
{\displaystyle {}2-5{\mathrm {i} }}
.
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