Question

factor 150-5t-5t^2

Answer 1

First factor out a 5

Answer 2

whoops lets rearrange it -5t^2-5t+150
so factor out a -5

Answer 3

-5(t^2+t-30)

Answer 4

did u follow what i did so far?

Answer 5

yes

Answer 6

so -5(x+6)(t-5) ?

Answer 7

yuppppp :)

Answer 8

thanks so the full questions wasss a stone is thrown straight down from a tall building. h=150-5t-5t^2, h in meters and t in seconds. how tall is the building ?

Answer 9

also when the does the stone hit the ground

Answer 10

ok so the the ball begins at the height of the building so at t=0 seconds you will find out the height of the building. So plug in t=0

Answer 11

150=h

Answer 12

?

Answer 13

yup

Answer 14

okay so the building 150 meters high. how do I find out when the stone hits the ground?

Answer 15

ok so when the ball hits the ground what is the height of the ball? its obv at 0 so plug in h as 0 ok

Answer 16

would it beeee in 5 seconds? cause when you factor -5(t+6)(t-5) so then t=-6 and t=5 so 5 seconds?

Answer 17

yes correcct

Answer 18

thanks ! :)