Question

Help please

Answer 1

yes?

Answer 2

Which graph shows the quadratic function y = 3x2 + 12x + 14?
A
B
C
D

Answer 3

@ali2x2

Answer 4

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.