Question 487176
(3n-150)2+(3n)2=(2440)2
9n2-900n+22500+9n2=5953600
18n2-900n-5931100=0
9n2-450n-2965550=0
*[invoke quadratic "x", 9, -450, -2965550 ]
Throwing out the negative answer, we get the speeds of the planes to be approximately 600 mph for the northbound plane, and 550 mph for the eastbound plane..