Solve By completing the square: -8x=3x squared -1?

Question

also..... A rock is thrown from the bottom of a tall building. The distance, in feet , between the rock and the ground (t) seconds after it is thrown is given by d=-16t squared -2t+405.How Long after the rock is thrown is it 300 feet from the ground?


Please HELP!!!!!!!

Answer 1

You can't complete the square with a coefficient of more then 1 on the sqaured term.

Answer 2

Now, how are you going to learn unless you do your own homework? Study