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in Complex Numbers by (29.6k points)
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Evaluate the following : 2x3 + 2x2 – 7x + 72, when x = \(\frac{3-5i}{2}\)

1 Answer

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Best answer

Given:

⇒ x =  \(\frac{3-5i}{2}\)

⇒ 2x3+2x2-7x+72

⇒ -68+72 

⇒ 4 

∴ 2x3+2x2-7x+72=4

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