Tuesday

July 29, 2014

July 29, 2014

Posted by **miss b** on Wednesday, December 19, 2012 at 8:47pm.

Here's what I did:

2b^2+b=6

b^2+1/2b=3

b^2+1/2b+(1/2)^2=3+(1/2)^2

(b+1/2)^2=3+1/4

b+1/2=+/- <13/4>

b=-1/2+/-<13>/2

b=(-1+/-<13>)/2

<> means its in a radical and +/- means plus or minus

- math... Ms, Sue can you help? -
**Reiny**, Wednesday, December 19, 2012 at 10:31pmThe error is in your third line

you take 1/2 of the middle coefficient, and then square it

(1/2)(1/2) = 1/4 --- (1/4)^2 = 1/16

3rd line:

b^2 + (1/2)b + 1/16 = 3 + 1/16

(b+1/4)^2 = 49/16

b + 1/4 = ± 7/4

b = -1/4 ± 7/4 = 6/4 or -8/4**b = -2 or 3/2**

since we have rational answers, we know it would have factored to

(x+2)(2b-3)

= 2b^2 + b - 6 , the original.

**Related Questions**

math To MS.SUE - Ms sue i really want a hundred percent on one algebra test im ...

math - I asked sue a question yesterday and don't understand the answer can you ...

Fractions - Hi Sue, That's the same answer I got, but for some reason I got it ...

introductory algebra - I had these problems on my test and for some reason got ...

Maths - There was a question: A gallon jug of milk is 3/4 full. After breakfast...

math - I am doing something wrong when I work this question. Can someone show me...

Thanks Tutors - To all the tutors here, i know i was suppose to ask a question ...

Statistics - A test is made of H0: mean = 27 versus H1: mean < 27. The true ...

Social Studies 7R (answer quick) - I got my Native Americans test back today ...

pre calc - Solve: (x+5/x)+(6/x-4)=(-7/x^2-4x) I multiplied the entire function ...