Question 128653
Let's do your problem working backwards from your answer.


{{{(x+2)(x-1)}}}


Apply FOIL:


{{{x^2-x+2x-2}}}


{{{x^2+x-2}}} which is not the same thing as {{{x^2-x-2}}}


You did get the numbers correctly, that is the 2 and the 1, but you have the signs reversed.  Apply FOIL to {{{(x-2)(x+1)}}} and see what I mean.


For the other one, let's check your answer again by applying FOIL:
{{{(2x+3)(x-1)}}}


{{{2x^2-2x+3x-3=2x^2+x-3}}}.  Again, you have the same problem.  The sign on the {{{x^1}}} term is incorrect.  What do you think was wrong this time?