I am posting this for my friend who does not have the internet:(adsbygoogle = window.adsbygoogle || []).push({});

Yes, I know it's easy but even following an example in the book, I can't come up with the correct answer.

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The roots and degree of a polynomial function are given. Write the equation in standard form.

roots: 2, -2i | degree:4

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I thought to start f(x)=(x-2)(x-2i)(x+2i) and simply expand, but this would leave me with a degree 3 answer.

The final correct answer is x^4 - 4x^3 + 8x^2 - 16x + 16

Would anyone be so kind as to show me how to attain this answer step by step?

Thanks in advance.

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# Calculus expansion

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