Thursday

July 24, 2014

July 24, 2014

Posted by **Mary** on Thursday, September 22, 2011 at 7:53pm.

Really need help! don't know where to start.

- Calculus -
**Steve**, Friday, September 23, 2011 at 1:14pmReview the properties of polynomials with real coefficients. If they have complex roots, the roots appear in conjugate pairs. So, since you have roots 4i and 5i, the other roots are -4i and -5i.

Recall that x^2 + a^2 = (x-ai)(x+ai)

So, your polynomial is (x^2+16)(x^2+25) = x^4 + 41x^2 + 400

**Related Questions**

calculus--please help!! - I have two questions that I don't understand and need ...

pre-calculus - form a polynomial f(x) with real coefficients having the given ...

pre-calculus - form a polynomial f(x) with real coefficients having the given ...

college algebra - form a polynomial f(x) with real coefficients having the given...

algebra - form a polynomial f(x) with real coefficients having the given degree ...

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

College Algebra! help! - Form a polynomial f(x) with the real coefficients ...

College Algebra - Form a polynomial f(x) with real coefficients having the given...

College algebra - Form a polynomial f(x) with the real coefficients having the ...

college algebra - Form a polynomial, f(x), with real coefficients having the ...