barreraA
  • barreraA
Use the quadratic equation y = x2 + 3x + 9. Where does the vertex of the parabola lie? (Points : 5) below the x-axis above the x-axis on the x-axis on the y-axis
Mathematics
katieb
  • katieb
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barreraA
  • barreraA
i think this one is A @sasogeek
Nnesha
  • Nnesha
\[\huge\rm x=\frac{ -b }{ 2a }\] formula to find x coordinate of vetex
barreraA
  • barreraA
ok thanks but i just want to know if im right or wrong @Nnesha

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Nnesha
  • Nnesha
nope that's incorrect substitute x value y=x^2+3x+9 solve for y y is positive or negative ?
barreraA
  • barreraA
i think its between B and D @Nnesha
Nnesha
  • Nnesha
so which one do not guess :-)
Nnesha
  • Nnesha
\[\huge\rm Ax^2+Bx+C=0\] quadratic equation A leading coefficient C is constant term
barreraA
  • barreraA
b above the x-axis @Nnesha
Nnesha
  • Nnesha
is that an educated guess or are u 100% sure ?? :=)
barreraA
  • barreraA
thanks for the help @Nnesha
Nnesha
  • Nnesha
np :=)

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