Posted by **HM** on Saturday, September 17, 2011 at 2:03pm.

r^2+10r-23=0

I used the quadratic formula and I got a -5+2√12

However the real answer is -5+4√3

What am I doing wrong?

- College Math -
**Anonymous**, Saturday, September 17, 2011 at 2:41pm
A survey of 100 people to determine their preferred source of information gave the following results:

65 watched television

39 read the newspaper

39 listened to the radio

20 watched television and read the newspaper

27 watched television and listened to the radio

9 read the newspaper and listened to the radio

6 watched television, read the newspaper and listened to the radio

a) How many people surveyed used another means of communication other than the three listed?

b) How many people surveyed used only one of the three methods of communication?

- College Math -
**Quidditch**, Saturday, September 17, 2011 at 5:07pm
You got the right answer! It just needed to be reduced.

-5 + 2*(12)

=-5+2*(4*3)

=-5+2*4 * 3

=-5+2*2*3

=-5+4*3

- College Math -
**Quidditch**, Saturday, September 17, 2011 at 5:08pm
My Alt+251 keyboard did not post as a square root--reposting...

- College Math -
**Quidditch**, Saturday, September 17, 2011 at 5:11pm
-5+2*SQR(12)

=-5+2*SQR(4*3)

=-5+2*SQR(4)*SQR(3)

=-5+2*2*SQR(3)

=-5+4*SQR(3)

## Answer This Question

## Related Questions

- Math - Find an equation of the line that bisects the obtuse angles formed by the...
- grade 11 math - I don't get how to do this. I'm so lost please help me. ...
- Algebra - Simplify the expressions and solve the equations 1. 2√3 - √...
- 8th grade algebra - Can you check my answers? 1. 3√20/√4 = 3√(...
- amth/algebra - can someone help me with simplification: 20/5 - 1/5 my first ...
- Math - I need someone to check my homework answers. I don't really know this ...
- math - I just want to see if my answers are correct and if no, can you please ...
- math - I just want to see if my answers are correct and if no, can you please ...
- Algebra 2 - Can someone help me with this radical expression please? The problem...
- Algebra 1 - Find the roots of each quadratic polynomial. 1. 16x + 40 + 2x^2 A: ...

More Related Questions