how do u find t in d= vt+1/2 at^2?

Question

tkhunny · Answer

It's a quadratic equation.  Do you recall complaining about solving SO MANY of those?!  Now's your chance to prove that you get it!

kc_kennylau · Answer

You plug all the values in and solve the quadratic equation

anonymous · Answer

ii dont get it... :'(        coz theres 2 ts in it so u cnat rearrange the formula to find t....

tkhunny · Answer

You didn't listen to me.  Do you remember the quadratic formula?  You can do it!!

anonymous · Answer

i think ive rearraged the formula tp 2(t^2 + 32t - 70)=0

tkhunny · Answer

If you were given d, v, and a, so that you have this result, then what is now preventing you from solving it?

anonymous · Answer

i cant solve it though, argh im so dumb

tkhunny · Answer

What class are you in?

kc_kennylau · Answer

Do you know how to solve quadratic equations? There are three ways of solving one.

tkhunny · Answer

...or more.

anonymous · Answer

i do but idk what multiples of 70 can add to 32

tkhunny · Answer

Why are you trying to factor?  Don't do that.

tkhunny · Answer

What were you given for d, v, and a?

kc_kennylau · Answer

If no multiples of 70 can add to 32, you can use the second or the third way.

kc_kennylau · Answer

The second way is completing the square, the third way is quadratic formula

anonymous · Answer

d=120 v=32 a=9.8

kc_kennylau · Answer

d=vt+1/2 at^2
120 = 32t + 1/2 9.8t^2
120 = 32t + 4.9t^2

kc_kennylau · Answer

4.9t^2+32t-120=0
49t^2+320t-1200=0

kc_kennylau · Answer

How the hell did you get 2(t^2 + 32t - 70)=0

anonymous · Answer

lol i think im too tired.... gonna take a rest

anonymous · Answer

You should listen to tkhunny, he asked you a couple of times, do you recall the quadratic equation... but you seem to keep ignoring him, to solve t you need to use it.