A few days ago
quadratic equation/ completing the square question?
water from a fire hose is sprayed on a fire 15 m up thee side of a wall. the equation h= -.011x^2 + x + 1.6 models the height of the jet of water and the horizontal distance from the nozzle in metres. what is the farthest distance back from the building that a firefighter could stand and still reach the fire?
i first tried quadratic equation, like this:
0 = -.001x^2 + x + (16-15)
i got roots of 91.91 and -1
and then i tried completing the square, and got
h = -.001(x-500)^2 + 251
im thinking that the answer’s probably 91.19, but im not sure why. can anyone please explain? thanks
Top 1 Answers
A few days ago
Favorite Answer
-b+sqrroot of bsquare-4ac
all of it divided by 2a.
then do the same for -b-sqrroot of bquare-4ac
all of it divided by 2a
You get two answers pug them back in the problem and see which one checks out.
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