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HelloKitty17

  • one year ago

Help please

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  1. anonymous
    • one year ago
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    yes?

  2. HelloKitty17
    • one year ago
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    Which graph shows the quadratic function y = 3x2 + 12x + 14? A B C D

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  3. HelloKitty17
    • one year ago
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    @ali2x2

  4. OregonDuck
    • one year ago
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    You could always go with the old school approach of actually computing some values and looking at the graph! x=0 is a good candidate because it is trivial to compute. y=3x2+12x+14=3(0)2+12(0)+14=14 Any graph not containing a curve going through (0,14) can immediately be rejected. Unfortunately, none of the graphs actually show the y-intercept, probably to prevent this approach from being so easy :-) Next choice is x = 2 which certainly does appear on two of the graphs: y=3(2)2+12(2)+14=12+24+14=50 We can reject B and D because they do have a point at x=2 and it isn't y=50 To decide between A and C, you could do x = -1 or x = -2, -1 is a bit easier: y=3(−1)2+12(−1)+14=3−12+14=5 Graph C is the one that goes through the point (-1,5) so it is our choice.

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