anonymous
  • anonymous
Solve x2 + 6x + 7 = 0. Options are below!!!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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  • anonymous
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  • anonymous
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anonymous
  • anonymous
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hartnn
  • hartnn
know quadratic formula ?
hartnn
  • hartnn
Compare your quadratic equation with \(ax^2+bx+c=0\) find a,b,c then the two roots of x are: \(\huge{x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}}\)
anonymous
  • anonymous
\[\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
anonymous
  • anonymous
How do I apply that to this problem? Like i'm having trouble setting it up
hartnn
  • hartnn
none of the options are correct b^2-4ac = 36-28 = 8 so there should be sqrt 8 in options or sqrt 2
hartnn
  • hartnn
couldn't u find, a,b,c ?
anonymous
  • anonymous
Those are the only options.......
hartnn
  • hartnn
then your question must be incorrect
hartnn
  • hartnn
check it
hartnn
  • hartnn
also see your previous question
hartnn
  • hartnn
for this its, (-6+- sqrt 8)/2 = (-3+- sqrt2)
anonymous
  • anonymous
Solve x2 + 6x + 7 = 0
hartnn
  • hartnn
for that (-3+- sqrt2)
anonymous
  • anonymous
Oh my goodnes!!!!1 I'm SO sorry
anonymous
  • anonymous
i see what occurred
anonymous
  • anonymous
the question is: Solve 3x2 + 4x = 2
hartnn
  • hartnn
right, 3x^2+4x-2=0 now apply the formula can u find,a,b,c first ?
anonymous
  • anonymous
3, 2, 4?
hartnn
  • hartnn
|dw:1352747869498:dw|
anonymous
  • anonymous
a = 3 b = 4 c = -2
hartnn
  • hartnn
yes. now what is b^2-4ac = ?
anonymous
  • anonymous
one moment
anonymous
  • anonymous
16 - 4(3)(-2)???
anonymous
  • anonymous
four times a c? or four times a times c?
hartnn
  • hartnn
yes, evaluate that
anonymous
  • anonymous
It equals 40
hartnn
  • hartnn
yes, now put all values in formula and tell me what u get for x.
anonymous
  • anonymous
ok
anonymous
  • anonymous
This is how I set it up: -4+sq root 4^2-4(3)(-2)/2(3)
anonymous
  • anonymous
= 36
anonymous
  • anonymous
@hartnn
hartnn
  • hartnn
x1=[-4 + sqrt (40)] / (2*3) = ? x2=[-4 - sqrt (40)] / (2*3) = ?
hartnn
  • hartnn
got that ^ ?
anonymous
  • anonymous
Yes!! :)
hartnn
  • hartnn
got final answer then ?
anonymous
  • anonymous
3.7
anonymous
  • anonymous
-13.4 for the second
hartnn
  • hartnn
from the options ? 3.7 is not in options keep sqrt 40 as 2sqrt 10 only
anonymous
  • anonymous
option b
hartnn
  • hartnn
absolutely correct! got it ?
anonymous
  • anonymous
YES!!!!!!!!!!!! It makes sense! why couldn't I see that on my own?? Thank you!!!!!!

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