anonymous
  • anonymous
Solve. 3x2 – 7x – 2 = 0
Mathematics
katieb
  • katieb
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jhonyy9
  • jhonyy9
do you know how you can solving a quadratic ?
jhonyy9
  • jhonyy9
us formula of discriminant
jhonyy9
  • jhonyy9
D = b^2 -4ac

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jhonyy9
  • jhonyy9
so you dont know it how ?
anonymous
  • anonymous
no
anonymous
  • anonymous
\[3x^{2}-7x-2=0\] Use the formula that jhonyy9 gave to calculate the Discriminant \[D=b^{2}-4ac\] now use the quadratic formula which is \[\frac{ -b \pm \sqrt{D} }{ 2a }\] where a=3 b=-7 and c=-2
anonymous
  • anonymous
uhm ?
anonymous
  • anonymous
we use these formula's to solve the quadratic equations - \[ax^{2}+bx+c=0\]
anonymous
  • anonymous
I have no idea how to do it
anonymous
  • anonymous
\[x=\frac{-b \pm \sqrt{D} }{ 2a }\]
anonymous
  • anonymous
just put the values. first to calculate D and then in the above formula.
anonymous
  • anonymous
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&sqi=2&ved=0CDEQFjAA&url=https%3A%2F%2Fwww.purplemath.com%2Fmodules%2Fsolvquad4.htm&ei=OQxnUfHSAcmrrAe5x4DYBQ&usg=AFQjCNEhv3GygcSBUF_1nLDJ4MLIgY0wqA&sig2=UEHMhQOUEoEkFXKGSiNq0A&bvm=bv.45107431,d.bmk&cad=rjt u can also refer this site
anonymous
  • anonymous
is the answer \[x=\frac{ 7\pm \sqrt{73} }{ 6 }\]
anonymous
  • anonymous
yes :-) ..!!
anonymous
  • anonymous
yayy

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