anonymous
  • anonymous
Find the Vertex: f(x)= -3x^2-7x+6
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@saifoo.khan helpppp lol
saifoo.khan
  • saifoo.khan
Hey. To find vertex there's a shortcut.
anonymous
  • anonymous
uh huh

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More answers

saifoo.khan
  • saifoo.khan
to find the x-cordinate, use this formula: -b/2a
saifoo.khan
  • saifoo.khan
-(-7)/2(-3)
anonymous
  • anonymous
that will give me the vertex ?
saifoo.khan
  • saifoo.khan
Yes. "x-cordinate" of vertex.
saifoo.khan
  • saifoo.khan
Solve it first..
anonymous
  • anonymous
kk hold on :)
saifoo.khan
  • saifoo.khan
Holding.. :)
anonymous
  • anonymous
got 7/6
anonymous
  • anonymous
vertex is (h,k) right? so i believe that is the "h" ?
saifoo.khan
  • saifoo.khan
Perfect. ^
saifoo.khan
  • saifoo.khan
Find k now.
anonymous
  • anonymous
how to find k lol ?
saifoo.khan
  • saifoo.khan
Lol. Use GOogle. Jk.
anonymous
  • anonymous
i got it lmao :))
anonymous
  • anonymous
hold on
saifoo.khan
  • saifoo.khan
Okay. so now use 7/6 to find it. y = -3x^2-7x+6 y = -3(7/6)^2 -7(7/6) + 6 solve.
anonymous
  • anonymous
got decimal :( hate decimal
anonymous
  • anonymous
so the vertex would be : (7/6, -6.24) ?
saifoo.khan
  • saifoo.khan
Should be 121/12
anonymous
  • anonymous
wtf ?
anonymous
  • anonymous
how? :O
anonymous
  • anonymous
-156/25
anonymous
  • anonymous
hey come back here >:o
saifoo.khan
  • saifoo.khan
VERTEX SHOULD BE -7/6. -_-
saifoo.khan
  • saifoo.khan
THE X-CORDINATE.
anonymous
  • anonymous
CALM DOWN !! CAPS WAR XD
saifoo.khan
  • saifoo.khan
ONE NEGATIVE SIGN RUINS EVERYTHING. >_<
anonymous
  • anonymous
so -7/6 because its opposite of 7/6 ?
anonymous
  • anonymous
you suppose to change it everytime ?
anonymous
  • anonymous
how come my teacher didn't change it -_____-
saifoo.khan
  • saifoo.khan
No. we calculated the x-cordinate wrong in the first place.
anonymous
  • anonymous
oh....XD
saifoo.khan
  • saifoo.khan
\[-\frac{b}{2a} \to -\frac{(-7)}{2(-3)}\to \frac{7}{-6} \to -\frac 76\]
anonymous
  • anonymous
ohhhhhhhhh i see now lmao hhahaha :D
anonymous
  • anonymous
omfg...my whole problem is wrong, thanks saif ! lol : XD
anonymous
  • anonymous
+99 medals
saifoo.khan
  • saifoo.khan
;D Thanks.
anonymous
  • anonymous
hmm instead of 121/10 should i just leave it as 10.08 cuz i have to graph this afterward ?
anonymous
  • anonymous
great now i gotta calculate x-int and y-int :| let see......
saifoo.khan
  • saifoo.khan
Sure. Same thing. Depends on in what format your teacher wants
anonymous
  • anonymous
stay there.. lol
saifoo.khan
  • saifoo.khan
Lol. okays.
anonymous
  • anonymous
stuck lol....find x-intercept?
anonymous
  • anonymous
i know let y=0
anonymous
  • anonymous
0=-3x^2-7x+6
anonymous
  • anonymous
-6=-3x^2-7x <-----stuck here..
saifoo.khan
  • saifoo.khan
Use quadratic formula
anonymous
  • anonymous
oh yee
saifoo.khan
  • saifoo.khan
https://www.khanacademy.org/math/algebra/quadratics/quadratic_formula/v/quadratic-formula-1
anonymous
  • anonymous
but the way my teacher did it was to set y=0 and just add and divide stuff on left and right side...which is confusing but i suppose we can use quadratic aswell :)
saifoo.khan
  • saifoo.khan
Your teacher must have used the "completing the square" method. It's hella confusing. It confuses me too. :/
anonymous
  • anonymous
yeah thats what that was, completing the square lol.... ok i got y= 7+- sqrt(-23)/-6 and what's next ?
anonymous
  • anonymous
i dont think u can reduce it down or anything right? and u can't even square root a negative
saifoo.khan
  • saifoo.khan
https://www.khanacademy.org/math/algebra/quadratics/quadratic_formula/v/quadratic-formula-1
saifoo.khan
  • saifoo.khan
No. We can't reduce.
saifoo.khan
  • saifoo.khan
u can't even square root a negative Yes you're very right.
anonymous
  • anonymous
ohh i get it, it's 7+- 23i/-6
saifoo.khan
  • saifoo.khan
Roots are: -14 and 0.
saifoo.khan
  • saifoo.khan
Roots are: -3 and 2/3
anonymous
  • anonymous
what? @_@
anonymous
  • anonymous
was that you on the video? https://www.khanacademy.org/math/algebra/quadratics/quadratic_formula/v/quadratic-formula-1
saifoo.khan
  • saifoo.khan
Haha. Ofcourse not.

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