Help!!!! a missile is launched from the ground. its height, h(x), can be represented by a quadratic function in terms of time, x, in seconds. after 1 second, the missile is 103 feet in the air; after 2 seconds, it is 240 feet in the air. find the height, in feet, of the missile after 11 seconds in the air.

Question

Help!!!! a missile is launched from the ground.  its height, h(x), can be represented by a quadratic function in terms of time, x, in seconds.        after 1 second, the missile is 103 feet in the air; after 2 seconds, it is 240 feet in the air.       find the height, in feet, of the missile after 11 seconds in the air.

anonymous · Answer

@hotdancingbabe14

xapproachesinfinity · Answer

eh let's try tackle this! can we?
@lexikaylynn

xapproachesinfinity · Answer

we recall that the quadratic function is written h(x)=ax^2+bx+c
in general

anonymous · Answer

ya sorry i didnt know you replied to this lol

anonymous · Answer

@iGreen  or @micahm  can you help me?

micahm · Answer

name of lesson

anonymous · Answer

solving problems with quadratic functions

micahm · Answer

i don't know this type of math sorry

anonymous · Answer

:( dam @iGreen  do you know this?

xapproachesinfinity · Answer

I'm thinking that at t=0 the height is also zero (they said the ground level)
then we conclude that c=0
so we have h(x)=ax^2+bx
if we put what we now already
h(1)=a+b=103
h(2)=4a+2b=240
we find a and b
then after that we can find the height for any time

anonymous · Answer

i dont get how that makes scene?? :o

xapproachesinfinity · Answer

hehe first of all you agree that h(x)=ax^2+bx+c