Posted by **Rory** on Thursday, November 16, 2006 at 7:35pm.

Factor 2x²+13x+40

I thought with this sort of problem you are supposed to multipy 40 by 2 and get 80 and then come up with two factors that equal 13. If this doesn't work, you are supposed to factor out a number/variable.

Since neither of these methods work, is this problem unable to be factored, or am I mistaken?

Thanks in advance.

i thought it would be 15x3+40. I am not sure though

I don't think it can be factored. The factors of 40 are

40*1

20*2

10*4

8*5

and none of those number will work.

For

a x^2 + bx + c

calculate the discriminant:

b^2 - 4 a c.

If it is negative it cannot be factored.

In this case it is -151. The factorization involves the square root of the discriminant. If it isn't rational you won't be able to find the factorization by inspection easily either.

## Answer This Question

## Related Questions

- algebra - this is what u do on your first problem....first u take out the ...
- math/algebra - subtract. express in simplest form 13x/30 - 4x/ 15 = factor the ...
- Algebra 2 - 1.) The cost in C dollars of manufacturing x bicycles at Holliday's ...
- algebra2 - Solve each of the following quadratic equations. can some explain how...
- science help - Two factors which cause global climate change are listed below. ...
- pre calc - A polynomial f(x) with real coefficients and leading coefficient 1 ...
- Chemistry (Check) - classify each of these statements as always true, sometimes ...
- help...solving a polynomial....algebra - solve this please....help me....12x(...
- algebra - 3ax^2 - 27a You can factor that into 3a (x^2 - 9), which also equals ...
- Factor - How do I factor these: 2x2 - 16x + 30 4x^2-9 x^2-5x 5x^2-26x+5 25x^2+4 ...

More Related Questions