Question

NEED HELP ON QUIZ what are the vertex focus and directrix of the parabola with the given equation y=1/28(x-4)^2-5
a)vertex:(4,-5);focus:(4,-12);directrix:y=2
b)vertex:(-4,-5);focus:(4,2);directrix:y=2
c)vertex:(-4,-5);focus:(4,-12);directrix:y=-12
d)vertex:(4,-5);focus:(4,2);directrix:y=-12

Answer 1

\[Y=\frac{ 1 }{28 }(x-4)^2-5\]

Answer 2

so that means that your centeror vertex is (4,-5) and eliminate b and c

Answer 3

The equation is
so divide the 1/28 by 4 to get your p value....

Answer 4

the p value tells you to go up -p away from the vertex and +p from the vertex to reach your directrix and focus

Answer 5

thank you!

Answer 6

yup no problem