-16t2+40t=0
i solved like his
-16t2=-40
-16/-40 = 2.5t
i got i right, but i'm still confused and feel like i got it right out of coincidence, becase why does he second power disappear?
-16t2+40t=0
i solved like his
-16t2=-40
-16/-40 = 2.5t
why does he second power disappear
It looks wrong because you left the "t" off the 40t when you took it to the other side.
it should have looked like this –16t2 = –40t
Except I'd have first multiplied both sides by –1
16t2 = 40t
divide both sides by 8t and obtain 2t = 5
divide both sides by 2 and obtain t = 5/2 = 2.5
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