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-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?

 Oct 6, 2022
 #1
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-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  

.

 Oct 6, 2022
 #2
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appreciate it

Guest Oct 6, 2022

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