anonymous
  • anonymous
A. x = 2 B. x = 2.5 C. x = -1 D. x = 0.5
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
So what's the question?
anonymous
  • anonymous
x^2-3x=-5/4 Which choices are solutions to the following equation?
anonymous
  • anonymous
Have you tried using the quadratic equation?

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More answers

anonymous
  • anonymous
no how ?
anonymous
  • anonymous
this is the quadratic:\[-b \pm \sqrt{b ^{2}-4ac}/2a\]
anonymous
  • anonymous
is it -1
anonymous
  • anonymous
sorry it didnt come out right http://en.wikipedia.org/wiki/Quadratic_equation
anonymous
  • anonymous
no its going to be two values
anonymous
  • anonymous
so you first want to set the given equation =0 kk? How do you do that?
anonymous
  • anonymous
yea -1 and 2
anonymous
  • anonymous
do wht .
anonymous
  • anonymous
\[x ^{2}-3x+5/4\]
anonymous
  • anonymous
all that =0
anonymous
  • anonymous
wht ? confused .
anonymous
  • anonymous
whts tht equation for .
anonymous
  • anonymous
kk wait
anonymous
  • anonymous
okay
anonymous
  • anonymous
\[ax ^{2} + bx + a =0 \] where you plug is a b c in the quadratic equation \[(-b \pm \sqrt{b ^{2}-4ac})/(2a)\]
anonymous
  • anonymous
to get to values
anonymous
  • anonymous
can you tell me the answer please .
anonymous
  • anonymous
in this case a=1 b=-3 a=5/4
anonymous
  • anonymous
umm just plug it in I gave you want to plug in
anonymous
  • anonymous
it didnt give me no answer
anonymous
  • anonymous
just plug in x =2, x = 2.5, x = -1 and x = 0.5 in the equation and see which value solves it. That will be your answer.
anonymous
  • anonymous
im still aint geting no answer something wrong
anonymous
  • anonymous
put x = 2 in \[x ^{2}-3x = -5/4\]
anonymous
  • anonymous
you will get \[2^{2}-3*2 = -5/4 => 4-6 = -5/4=>-2=-5/4\]
anonymous
  • anonymous
idk can i have the answer please .
anonymous
  • anonymous
-2 is obviously not equal to -5/4. so x = 2 is not the answer. similarly put x = 2.5, x = -1, x = 0.5 in the equation and see which one solve the equation
anonymous
  • anonymous
No, i can't do your problem for you. I can only show you how to do your problem
anonymous
  • anonymous
well , i dont know how to do this so . its only right if you do .
anonymous
  • anonymous
I showed you how to do it. just follow the steps.
anonymous
  • anonymous
rd can you tell me how to put it in the calculator .
anonymous
  • anonymous
Do you you know how to square things?\[X^2 \] ?
anonymous
  • anonymous
yess that = 1/2
anonymous
  • anonymous
no \[x^2 = x \times x\]
anonymous
  • anonymous
1/4
anonymous
  • anonymous
so just replace x with the given values and if the the equation makes sense then it works.
anonymous
  • anonymous
Do you know how to multiply and subtract?
anonymous
  • anonymous
yeaa
anonymous
  • anonymous
then just replace X with all the given values
anonymous
  • anonymous
and if the equation makes sense then thats one of the answers
anonymous
  • anonymous
so you sayinq 1/4 subtract all choices .
anonymous
  • anonymous
how did you get 1/4
anonymous
  • anonymous
1/2*1/2
anonymous
  • anonymous
well i got -1 thts the only answer i got
anonymous
  • anonymous
but its two answers
anonymous
  • anonymous
why is it two answers?
anonymous
  • anonymous
- 1 and 0.5
anonymous
  • anonymous
then you must have done some calculation wrong. Post what you got when you substituted x = 0.5
anonymous
  • anonymous
After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? A. http://media.apexlearning.com/Images/200712/03/a43220e6-97e8-4d20-a14d-11fd1ac1fc7f.gif B. http://media.apexlearning.com/Images/200712/03/c11f4c31-5d7b-4b71-8c3f-bffb49e48fa7.gif C. http://media.apexlearning.com/Images/200712/03/fd85edd2-763d-40eb-9ae8-7b626bdac1f0.gif D. http://media.apexlearning.com/Images/200712/03/83c6b595-efe4-4961-beb5-3e724a260a21.gif
anonymous
  • anonymous
cant view pics, permission denied.
radar
  • radar
Your reluctance to substitute the answers from using the quadratic formula is discouraging. The two answers you should of gotten were 5/2, AND 1/2. Substituting the 5/2 into your original formula would of resulted in:\[(5/2)^{2}-15/2+5/4=0\] 25/4-15/2+5/4=0 25/4-30/4+5/4=0 0=0 5/2 is a good answer. Now check out the 1/2

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