I have to factor each of these and find all roots I'm majorly confused

x^4 +18x^2 +81=0

x^3 +2x^2 −15x=0

x^4 +6x^3 +8x^2 =0

Question

I have to factor each of these and find all roots I'm majorly confused

x^4 +18x^2 +81=0

x^3 +2x^2 −15x=0

x^4 +6x^3 +8x^2 =0

geerky42 · Answer

for first one, you can create another variable, such as $u$, and let $u=x^2$, so equation will be $u^2+18u+81=0$

For others, you can factor x out.

anonymous · Answer

wait why would I need you and I have never done roots before so I don't know how to find them

geerky42 · Answer

have you find root for quadratic equation before? 

I don't know why you are given these problems if you have never find roots before...

anonymous · Answer

No I haven't and I missed a whole week of school due to an injury and she gave me the stuff for summer break and told me to look on like to figure things out

anonymous · Answer

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