SOLUTION: I have two problems that Im not sure how to work and I have a test coming up. Can you please explain how to do these types of problems? The first one is (x+1)(x-5) and the other

Algebra ->  College  -> Linear Algebra -> SOLUTION: I have two problems that Im not sure how to work and I have a test coming up. Can you please explain how to do these types of problems? The first one is (x+1)(x-5) and the other      Log On


   

Question 219696: I have two problems that Im not sure how to work and I have a test coming up. Can you please explain how to do these types of problems?
The first one is (x+1)(x-5) and the other one is
-3xcubed-xsquared-7 for a.) x=-1 ; b.) x=2
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


For the first one, use FOIL, First-Outside-Inside-Last











Add up the pieces:



Collect like terms:



The other two:



a. for

Substitute -1 for and do the arithmetic:



Since this is an algebra site, I'll let you do your own arithmetic.

b. for

Same thing, different number:



Again, do your own arithmetic.

John