Thursday

October 23, 2014

October 23, 2014

Posted by **Emily** on Sunday, August 22, 2010 at 8:28pm.

I've got : 8=a(6-h)^2+15, but i don't know what to do next.

- Math -
**Anonymous**, Sunday, August 22, 2010 at 8:40pmI will assume that your equation is such that the vertex is on the y-axis

Then your equation will be

y = ax^2 + 15 , (the h of your equation will be zero)

then (6,8) must lie on the equation

8 = a(6)^2 + 15

a = -7/36

equation: y = (-7/36)x^2 + 15

- Math -
**bobpursley**, Sunday, August 22, 2010 at 8:44pmthe peak is at 3,15, it turns downward so that at h=8 me the difference in x is 6.

h=-a(x-3)^+15

then

8=-a(6-3)^2+15

8=-9a+15

a=7/9

so, here is one that satisfies the statement

h=-7/9 (x-3)^2+15

- Math -
**Emily**, Sunday, August 22, 2010 at 9:24pmBobpursley, how do you know that the peak is at (3,15)?

- Math -
**Anonymous**, Sunday, February 13, 2011 at 3:27pmi dont know howto solve this either someone HELP

**Answer this Question**

**Related Questions**

Math - An engineer is desingning a parabloic arch, the arch must be 15 m high , ...

Math - Question: A tunnel with a parabolic arch is 12 m wide. If the height of ...

Math - gr.11 - A tunnel with a parabolic arch is 12m wide. If the height of the ...

MATH - test tomm so plz reply back fast a concrete bridge over a river has an ...

Algebra II - The shape of a supporting arch can be modeled by h(x)= -0.03^2+3x, ...

math - McDougal's Restaurant has a play area for children under and around their...

physics - in the distance you see an arch 192 meters high, you estimate your ...

Math - A tunnel with a parabolic arch is 12 m wide. If the height of the arcccch...

Algebra II - The question simply states-solve. -x^4+200=102x^2 I rearranged the ...

Trig - A bridge is built in the shape of a parabolic arch. The bridge has a span...