Can someone help me with number 4 and 5? Thank you very much. I attached an image of the problems. The book is brand new and i cant find any help.

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- Aug 18th 2012, 01:22 PMzmayfieldwb37MA 401 Applied diff equatins 2 Please help.
Can someone help me with number 4 and 5? Thank you very much. I attached an image of the problems. The book is brand new and i cant find any help.

- Aug 18th 2012, 04:06 PMHallsofIvyRe: MA 401 Applied diff equatins 2 Please help.
You seem to have misunderstood the purpose of this board. Show us what

**you**have tried and where you have problems and we will attempt to assist you and give hints.

I will say this much- problems 4 and 5 do NOT ask you to solve the equation. They only ask you to show that a given function**is**a solution. If you were given the equation $\displaystyle x^4- 3x^2+ 4x- 12= 0$, and asked to show that x= 2 is a solution, you would NOT attempt to solve the equation- just replace x with the number "2" and see if it works. - Aug 18th 2012, 04:15 PMzmayfieldwb37Re: MA 401 Applied diff equatins 2 Please help.
im sorry, i should say what i am doing. i was going to take the 2nd partial of (x+t)^4 with respect to x and t. then, see if they are equal. is this what it wants me to do?

- Aug 18th 2012, 04:42 PMzmayfieldwb37Re: MA 401 Applied diff equatins 2 Please help.
I ended up getting 12(x+t)^2 for both, so they are equal. That was easy...sorry. now for b.

- Aug 18th 2012, 04:47 PMHallsofIvyRe: MA 401 Applied diff equatins 2 Please help.
Yes, that's exactly right! Good work!

- Aug 18th 2012, 04:49 PMzmayfieldwb37Re: MA 401 Applied diff equatins 2 Please help.
I feel stupid haha. Was first day back :p

- Aug 18th 2012, 06:10 PMzmayfieldwb37Re: MA 401 Applied diff equatins 2 Please help.
Okay, here is my work for number 5. What did i do wrong because these do not seem to be the same. Thanks everyone for the help!