Posted by **saad** on Thursday, October 28, 2010 at 11:30am.

3x2+x+1=0

- college -
**jai**, Thursday, October 28, 2010 at 11:41am
since it's not factorable, we use quadratic formula:

x = [-b +- sqrt(b^2 -4ac)]/(2a)

where a=3, b=1, and c=1

substituting:

x = [-1 +- sqrt(1^2 - 4*3*1)]/(2*3)

x = [-1 +- sqrt(-11)]/6

thus

x = [-1 + i*sqrt(11)]/6 ; and

x = [-1 - i*sqrt(-11)]/6

*note: i = sqrt(-1)

hope this helps~

- college-typo -
**jai**, Thursday, October 28, 2010 at 11:44am
oops, some typo:

x = [-1 + i*sqrt(11)]/6 ; and

x = [-1 - i*sqrt(11)]/6

## Answer This Question

## Related Questions

- college algebra - Could you help me with this long division problem of a ...
- math - Divide -3x^3 - 2x^2 - x - 2 by x – 2. A. -3x2 - 8x - 17, R –36 B. -3x2 + ...
- algebra - Can someone please explain What polynomial has a graph that passes ...
- Math help please check - Add or Subtract for #3-4 3. (2x2 + 6x + 1) + (–7x2 + ...
- Math - Is this equation right is it worked correctly x 1 ----- - -------- x2-4 ...
- Algebra2 - Complete parts a – c for each quadratic function. a. Find the y-...
- college math - find the vertex and graph of y=.3x2+1.8x-2
- math - can someone help me and expalin how to do these five question please and ...
- math - Determine the remainder of the following polynomial divisions: (2 marks) ...
- College Algebra - let g(x) = 17x3 - 3x2 + 14x. What is the degree of this ...

More Related Questions