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rje123 · Sep 4, 2010, 04:51 AM

A football is thrown to a reciver 40 yards away. Using the quadratic formula
y = -0.025x(Squared) + x + 5 determine:
a) How many yards from the quarterback does the football reach it's maximum height and
b) What is the footballs' height at that distance.

galactus · Sep 4, 2010, 06:55 AM

Originally Posted by rje123

A football is thrown to a reciver 40 yards away. Using the quadratic formula

y = -0.025x(Squared) + x + 5 determine:

Why not use ^ for powers like so: -.025x^2

Instead of writing out the word 'squared'?

After all, that is what SHIFT 6 is for.

$y=\frac{-25}{1000}x^{2}+x+5$

a) How many yards from the quarterback does the football reach it's maximum height

Just use $x=\frac{-b}{2a}$

b) What is the footballs' height at that distance.

Just use $y=c-\frac{b^{2}}{4a}$

From the graph, I made the assumption it is thrown from ground level. That may not be the case. It is probably thrown from a height of 5 feet at (0,5).