quadratics factoring
Use the formula h(t)=60t-16t^2 where h(t) is the height of an object in feet, and t is the time in seconds. ignoring the staring height, how long after the arrow is released does it hit the ground?
3.75 seconds
solve: 3x^2+27=0
3i
x^2-10+9=0
1,9
5/-6i
5i/6
5i x 8i
40
Use the formula h(t)=30t-16t^2 where h(t) is the height of a flare launched from a boat, in feet, and t is the time in seconds. ignoring the starting height of the boat, at what time does the fare reach the water?
1.875 seconds
solve: x^2+6x-16=0
2, -8
X^2+18x+68=0
-9 +/- sqr 13
1/2i
-i/2
sqr -2 x sqr 7
- sqr 14