Form a polynomial f(x) from coefficient and it's 0

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Form a polynomial, f(x), with real coefficients having the given degree and zeros.
Degree: 4; zeros: 6i and 7i

I completely don't know what to do with this problem... if someone can solve and give a good explanation, I'd appreciate it.

Thanks.

  • Form a polynomial f(x) from coefficient and it's 0 -

    Because the coefficients of f(x) are REAL,
    f(x) has zeros: 6i and -6i, 7i and -7i.
    For example,

    f(x)=(x-6i)(x+6i)(x-7i)(x+7i)= (x^2+36)(x^2+49)

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