Two flares are launched from a life raft. The height h of the first flare in metres above the sea is modelled by the formula h1= t2+t+1meters,and the second flare is h2=4-t where t is the time
12 in seconds after the flare is launched. Determine
(i) Time taken and
(ii) Height when the two flares meet each other.
Hint: When two flares meet each other, their heights are the same (h1=h2).
Is that you Vinny ?
http://www.jiskha.com/display.cgi?id=1428740896
i) for time taken, you said it was 12 seconds
ii) the hint was to se h1 = h2 , well ???
t^2 + 1 = 4 - t
t^2 + t - 3 = 0
solve as a quadratic, reject the negative value of t