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August 20, 2014

August 20, 2014

Posted by **Lucy** on Saturday, August 23, 2008 at 1:32pm.

Answer:

(x+3i)(x-3i)(x-i)(x+i)=x^4+x^3-x^3i+9x^2+9x-9xi-9i

2)Determine if the expression 4m^5-6m^8+m+3 is a polynomial in one variable. If so, state the degree.

Answer: It is a polynomial in one variable; Degree = 8

Thanks

- Pre-calculus-check answers -
**Reiny**, Saturday, August 23, 2008 at 2:14pmyour first one would be

(x+3i)(x-3i)(x-i)(x+i) which is what you had, but then

=(x^2 - 9i^2)(x^2 - i^2) remember i^2 = -1

= (x^2 + 9)(x^2 + 1)

= .... you can finish that

your second question is correct

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