Question

I need help substituting numbers for the Quadratic Equations

Answer 1

1.Substitute the data provided for speed (v) and starting heights (s) into their proper positions in the formula
y = –16x2 + vx + s and write the equation corresponding with each motor in the space provided below.
Then identify the a, b, and c values for each where indicated. (6 points total, 2 points each)

The equation for motor A is:
a =
b =
c =

The equation for motor B is:
a =
b =
c =

The equation for motor C is:
a =
b =
c =

Answer 2

I just know that a = -16.

Answer 3

b = v
c = s

Answer 4

Motor A- 190 ft per sec
Motor B- 210 ft/ sec
Motor C- 230 ft/ per sec.

Answer 5

Forgot to include that.

Answer 6

oh - right - i was so confused about the 3 motors

Answer 7

well for A, b = 190, for B b = 210, and for C b = 230

Answer 8

So for C, is it just 0?

Answer 9

?

Answer 10

Oh, and 1 more thing, how do u find the vertex of these equations?

Answer 11

Oh, I got the first question...never mind! It is just zero. :)

Answer 12

I just don' know how to find the vertex.

Answer 13

you need to convert the formula into vertex form

for example if you have the equation

y = 2x^2 - 8x
find vertex form as follows:

y = 2(x^2 - 4x)
y = 2(x - 2)^2 - 4

the vertex is at x = 2 ( 2 comes from (x - 2))

Answer 14

So, that is how you do it? One more thing, x intercepts?

Answer 15

For the vertex's I keep getting negatives, are u supposed to?

Answer 16

the vertex's can be negatives yes
for the above example x coordinate of the vertex is 2
and y coordinate is found by plugging in x=2 into the expression
y = 2(2)^2 - 8(2) = 8 - 16 = -8

so vertex is at (2,-8)

Answer 17

the x intercepts are found by equating y = 0

y = 2x^2 - 8x = 0
and you solve for x

haven't you got any values for s?

Answer 18

My teacher just said to put 0 as s. :) Thx for ur help, I got it now!

Answer 19

yw