Question

two pillars support the archway entrance of a castle. h=-0.025d^2+d, where h represents height. d represents the horizontal distance in feet. How far apart are the pillars?

Answer 1

Do you see that when d =0, h also =0?

Answer 2

ok

Answer 3

set h to zero and d should be coordinant of half way point of 2 arches.

Answer 4

*pillars not arches i mean

Answer 5

No, h is zero at d=0 and at another point where the far arch is (not the halfway point). But solving for the other h=0 is the key.

Answer 6

Maybe @timo86m meant solving for h'=0 gives the halfway point.

Answer 7

you can do that also if she has taken calc 1