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anonymous
 one year ago
without drawing the graph of the equation, determine how many points the parabola has in common with the xaxis and whether its vertex lies above, on, or below the xaxis.
y=2x^2+x3
A. 2 points in common; vertex below xaxis
B. no points in common; vertex below xaxis
C. 1 point in common; vertex on xaxis
D. 2 points in common; vertex above xaxis
anonymous
 one year ago
without drawing the graph of the equation, determine how many points the parabola has in common with the xaxis and whether its vertex lies above, on, or below the xaxis. y=2x^2+x3 A. 2 points in common; vertex below xaxis B. no points in common; vertex below xaxis C. 1 point in common; vertex on xaxis D. 2 points in common; vertex above xaxis

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do you know how to tell whether the graph opens up or down?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0if the coefficient of x² is positive the parabola opens up. If it's negative the parabola opens down

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and to find the xcoordinate of the vertex use x = b/(2a)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so, the coefficient of x^2 is 2, right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so which way does the parabola open?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok. so now let's find the vertex. For a quadratic equation ax²+bx+c, the xcoordinate of the vertex is \[x=\frac{ b }{ 2a }\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0right. Now plug 1/4 in for x in your original formula to find the ycoordinate.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i got 4.25? which answer is that?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0show me what you did, please

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1433124251446:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay, so which answer is that? is the vertex below the xaxis?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0right, below the xaxis

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0and if it open up, in how many places does it cross the xaxis?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yesdw:1433124522429:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0can you help me with one more? that'll be all I need help with. and thanks for helping me.
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