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*ã(12)

=-5+2*ã(4*3)

=-5+2*ã4 * ã3

=-5+2*2*ã3

=-5+4*ã3

- 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)

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