Which student factored the expression x3 + 5x - 2x2 - 10 correctly based on their answer below?

Jane: (x - 2)(x2 + 5)
Mariah: (x + 2)(x2 + 5)
Roger: (x - 2)(x2 - 5)
Nethan: (x + 2)(x2 - 5)

Jane

Mariah

Roger

Nethan

Question

Which student factored the expression x3 + 5x - 2x2 - 10 correctly based on their answer below?

Jane: (x - 2)(x2 + 5)
Mariah: (x + 2)(x2 + 5)
Roger: (x - 2)(x2 - 5)
Nethan: (x + 2)(x2 - 5)

Jane

Mariah

Roger

Nethan

anonymous · Answer

what do u think?

radar · Answer

Here is what I think..I would try the easiest way.  I would look at their answers and eliminate obvious wrong answer.  I know that the product of the constants (5, and 2) must result in a -10 and I see that Mariah and Roger got a +10 so they are wrong.  That leaves only Jane and Nethan.

ttp · Answer

It's jane :)

radar · Answer

I know that the product of the 5 and x must be +5x and only Jane came up with that.

radar · Answer

This I know seems a lazy way, but it works.

radar · Answer

Anyway the questions is closed so I will return to my nap.