solve by factoring: 5t^2 - 10t = 0

Missy

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Joined
Jan 16, 2008
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I want to know if I done this problem right because it just don't look right to me so I'm really not too sure

5t^2 - 10t = 0

This is what I did 5t^2-10t=0; 5t*t +5t *2 = 5t (t - 2); 5t^2 + 10t so the answer is 5t (t + 2)
the only thing that I can see that has changed is that there is now a (+) instead of a (-)
it may be right but I'm just not to sure. Could you check and tell me if I'm right or wrong and what should I do.
You guys are a big help to an old lady
Thank you,
Missy
 

Subhotosh Khan

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Jun 18, 2007
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Re: solve by factoring

Missy said:
I want to know if I done this problem right because it just don't look right to me so I'm really not too sure

5t^2 - 10t = 0

This is what I did 5t^2-10t=0; 5t*t +5t *2 <<<<< Why do you have a + sign there? You started with -


= 5t (t - 2); 5t^2 + 10t so the answer is 5t (t + 2)
the only thing that I can see that has changed is that there is now a (+) instead of a (-)
it may be right but I'm just not to sure. Could you check and tell me if I'm right or wrong and what should I do.
You guys are a big help to an old lady
Thank you,
Missy
 

stapel

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Staff member
Joined
Feb 4, 2004
Messages
15,943
Missy said:
This is what I did 5t^2-10t=0; 5t*t +5t *2 = 5t (t - 2)...
How did you get that (5t)(-2) equalled 10t? Shouldn't it have equalled -10t? :shock:

Eliz.
 
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