SOLUTION: how do you factor 2x^2+11x+5?

Question 117772This question is from textbook Algebra 1
: how do you factor 2x^2+11x+5? This question is from textbook Algebra 1

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Looking at we can see that the first term is and the last term is where the coefficients are 2 and 5 respectively.

Now multiply the first coefficient 2 and the last coefficient 5 to get 10. Now what two numbers multiply to 10 and add to the middle coefficient 11? Let's list all of the factors of 10:

Factors of 10:
1,2,5,10

-1,-2,-5,-10 ...List the negative factors as well. This will allow us to find all possible combinations

These factors pair up and multiply to 10
1*10
2*5
(-1)*(-10)
(-2)*(-5)

note: remember two negative numbers multiplied together make a positive number

Now which of these pairs add to 11? Lets make a table of all of the pairs of factors we multiplied and see which two numbers add to 11

First Number	Second Number	Sum
1	10	1+10=11
2	5	2+5=7
-1	-10	-1+(-10)=-11
-2	-5	-2+(-5)=-7

From this list we can see that 1 and 10 add up to 11 and multiply to 10

Now looking at the expression , replace with (notice adds up to . So it is equivalent to )

Now let's factor by grouping:

Group like terms

Factor out the GCF of out of the first group. Factor out the GCF of out of the second group

Since we have a common term of , we can combine like terms

So factors to

So this also means that factors to (since is equivalent to )

-------------------------------
Answer:

So factors to

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