#5.8 The Quadratic Formula
- (2-30) even
- put the Quadratic Formula to a song---you will be singing it in front of class for a grade (25 points). You can do it by yourself or with a friend. Your choice. I don't care if you use Pop Goes the Weasel (there is a link to the right -----------------------------------------------------------------------> if you want to practice to Pop Goes the Weasel) or Alicia Keys, whatever. You choose. I just want you to know the quadratic formula. And no, you will not be able to use a note card when you're singing. That would be defeating the purpose. Just in case you don't know the lyrics to your song, here they are (yes, I added a couple of words at the beginning):
- "x equals the opposite of b plus or minus the square root of b squared minus 4ac all over 2a"
- (32-38) even -- just copy these
- copy the definition of the Discriminant of a Quadratic Equation on pg. 287
- copy the green box on pg. 288
- copy the Summary orange box on pg. 289
- I will go over all of these things tomorrow. Just make sure you have them copied BEFORE coming into class!
5 extra credit points!
for the first person to CORRECTLY post a solution/explanation to a problem. This means that 15 people can receive extra credit this evening since there are 15 problems for HW!
6 Comments:
congratulations to the following people for correctly posting a solution:
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By msichan, at Wednesday, October 11, 2006 3:41:00 PM
EVERYBODY.....
look at shantelee's explanation. she's got the perfect explanation. this is how i want to read the work if you are trying to get extra credit. shantelee, you just need to finish up the final answer and actually do the two math problems and you've got it!
#12) 9x^2+12x-5=0
a=9
b=12
c=-5
x=-b +/- sq.root of b^2- 4ac all over 2a
x=-12 +/- sq.root of 12^2-4(9)(-5)all over 2(9)
x=-12 +/- sq.root of 144-36(-5) all over 18
x=-12 +/- sq. root of 144+180 all over 18
x=-12 +/- sq.root of 324 all over 18
x=-12 +/-18 all over 18
-> divide by 2 to simplify
Final Answer:
x=-6 +/- 9 all over 9
By msichan, at Wednesday, October 11, 2006 3:44:00 PM
dani,
dani,
c = 12, not -2!
By msichan, at Wednesday, October 11, 2006 3:44:00 PM
thomas,
you don't divide 4 by 2. ALL OVER 2a means you've got to figure out the top before you can divde by the bottom!
By msichan, at Wednesday, October 11, 2006 3:46:00 PM
will,
all over 2a... check your "a"
By msichan, at Wednesday, October 11, 2006 3:47:00 PM
congratulations to the following people for correctly posting a solution:
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By msichan, at Wednesday, October 11, 2006 3:48:00 PM
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