College Math
posted by HM .
r^2+10r23=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?

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? 
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 
My Alt+251 keyboard did not post as a square rootreposting...

5+2*SQR(12)
=5+2*SQR(4*3)
=5+2*SQR(4)*SQR(3)
=5+2*2*SQR(3)
=5+4*SQR(3)
Respond to this Question
Similar Questions

amth/algebra
can someone help me with simplification: ã20/5  1/ã5 my first answer is 1/ã5 my second answer is 10 ã5/5 but the answere I have to choose from are: (a) ã20  5ã5/ã5 (b) ã20  ã5/5 (c) cannot be simplified … 
Math
I need someone to check my homework answers. I don't really know this stuff but i'm trying to do better in math this year. I didn't understand how to do some either. 1. √12 I got 2√3 2. √9a^3 I got 3a 3. √8 … 
Math
Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3xy=1 and x+y=2. a. (3√2 +√10)x(√10 + √2)y2√10+√2=0 b. (3√2  √10)x+(√10  √2)y+2√10+√2=0 … 
grade 11 math
I don't get how to do this. I'm so lost please help me. Determine the equation of the parabola with roots 2+√3 and 2√3, and is passing through the point (2,5) this is what i did but its the wrong answer: y= a[x + (2+√3)] … 
Algebra
Simplify the expressions and solve the equations 1. 2√3  √12 My answer: 2√3  2√3 = 0 2. √(5p + 5)^2 = √(6p + )^2 I got the answer p = 4 3. √(28) + √(63) + √(175) This one seems … 
Algebra 2
Can someone help me with this radical expression please? 
8th grade algebra
Can you check my answers? 1. 3√20/√4 = 3√(5)(4)/2 = 3(2)√5/2 = 3√5 2. 4√15/√9 = 4√15/3 3. √12/√16 = √4(3)/4 = 2√3/4 = √3/2 4. √10/√5 = √2 
Algebra
1. Simplify the expression: 4√18+5√32 A.45√2 B.32√2 C.116√2 D.9√50 2. Simplify the expression: 7√53√80 A.5√5 B.4√75 C.5 D.4√75 3. Simplify the expression: √21(√3+√14) … 
Algebra  Check My Work
For Question 18 Simplify the Radical Expression ***  My Answer 1.√45 3√5*** 2.√180x^2 6x√5*** 3.√150x^3 k^4 5xk^2√6x*** 4.√21y * 5√49y 35y√21*** 5.(The square root sign applies … 
Math
I really need help with a quadratic question. So the problem is kx^2+[k+2]x3=0 has roots which are real and positive. Find the possible values that k may have. The answer is 8+ √60<k<0 I get why they got 8+ √60 …