SOLUTION: I need help with two problem. 1.Can you give me an example of a polnomial and get its factors? 2.Can you factor this step by step? {{{x^2+8x+7}}}

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I need help with two problem. 1.Can you give me an example of a polnomial and get its factors? 2.Can you factor this step by step? {{{x^2+8x+7}}}       Log On


   



Question 211810: I need help with two problem.
1.Can you give me an example of a polnomial and get its factors?
2.Can you factor this step by step? x%5E2%2B8x%2B7

Answer by gypsy1274(9) About Me  (Show Source):
You can put this solution on YOUR website!
1. Creating a polynomial is simple. Start with your factors.
%28x-4%29+%28x%2B2%29 you can use any numbers you want for this. At this point, you can choose the operation + or - that you want as well. To get the polynomial, just FOIL. (First, Inside, Outside, Last)
First:x%2Ax=x%5E2; Inside:-4%2Ax=-4x; Outside:2%2Ax=2x; Last:-4%2A2=-8
So, the expression is:
x%5E2-4x%2B2x-8
Combine like terms:
x%5E2-2x-8 This is a polynomial and the factors are the ones you started with.
2. x%5E2%2B8x%2B7
To factor, we are going to do the exact opposite of what we did in problem number 1. Your first two numbers have to multiply to be x%5E2 so there is only one choice. It must be x*x.
(x(-+)?) (x(-+)?)
Next, to get the last numbers we need to find what adds to be 8 and multiplies to be 7. Since 7 is a prime number, there is only one choice (1,7)
(x(-+)7) (x(-+)1)
Now choose the operation. In this case, 7+1=8 and 7*1=7 so we will use the + operation in both factors.
(x+7) (x+1)