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redslothx
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 Posted: Sat Aug 29, 2009 3:25 pm Post subject: Easy Math Problem (?) |
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I'm helping someone do their homework, and i ran into a problem that doesn't make any sense >_>
Here it is.
g(x) = x^2+2x+3
[g(x+5)]
assuming i remember this correctly, it should be:
g(x+5) = (x+5)^2 + 2(x+5) + 3
g(x+5) = X^2 + 25 + 2x + 10 + 3
g(x+5) = X^2 + 2x + 38
According to the answers in the book, the answer should be:
x^2 + 12x + 38
I don't see where this 12x came from >_>
Help?
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AverageAzn247
Grandmaster Cheater
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Location: Austin,TX with 72 virgins
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| Posted: Sat Aug 29, 2009 3:39 pm Post subject: Re: Easy Math Problem (?) |
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| Ozymandias wrote: | I'm helping someone do their homework, and i ran into a problem that doesn't make any sense >_>
Here it is.
g(x) = x^2+2x+3
[g(x+5)]
assuming i remember this correctly, it should be:
g(x+5) = (x+5)^2 + 2(x+5) + 3
g(x+5) = X^2 + 25 + 2x + 10 + 3
g(x+5) = X^2 + 2x + 38
According to the answers in the book, the answer should be:
x^2 + 12x + 38
I don't see where this 12x came from >_>
Help? |
u foiled wrong. (x+5)^2 =/= x^2+25. It should be x^2+10x+25
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redslothx
Grandmaster Cheater Supreme
Reputation: 13
Joined: 27 Nov 2006
Posts: 1949
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| Posted: Sat Aug 29, 2009 3:43 pm Post subject: Re: Easy Math Problem (?) |
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| AverageAzn247 wrote: | | Ozymandias wrote: | I'm helping someone do their homework, and i ran into a problem that doesn't make any sense >_>
Here it is.
g(x) = x^2+2x+3
[g(x+5)]
assuming i remember this correctly, it should be:
g(x+5) = (x+5)^2 + 2(x+5) + 3
g(x+5) = X^2 + 25 + 2x + 10 + 3
g(x+5) = X^2 + 2x + 38
According to the answers in the book, the answer should be:
x^2 + 12x + 38
I don't see where this 12x came from >_>
Help? |
u foiled wrong. (x+5)^2 =/= x^2+25. It should be x^2+10x+25 |
(Confused)
Did you just get three different values from (X+5)^2
?
---------
the final answer at the back of the book said it was: X^2 + 12x + 38
so it can't be: X^2 + 10x + 25
(if that's what you meant)
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AverageAzn247
Grandmaster Cheater
Reputation: 34
Joined: 01 Oct 2007
Posts: 909
Location: Austin,TX with 72 virgins
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| Posted: Sat Aug 29, 2009 3:46 pm Post subject: Re: Easy Math Problem (?) |
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| Ozymandias wrote: | | AverageAzn247 wrote: | | Ozymandias wrote: | I'm helping someone do their homework, and i ran into a problem that doesn't make any sense >_>
Here it is.
g(x) = x^2+2x+3
[g(x+5)]
assuming i remember this correctly, it should be:
g(x+5) = (x+5)^2 + 2(x+5) + 3
g(x+5) = X^2 + 25 + 2x + 10 + 3
g(x+5) = X^2 + 2x + 38
According to the answers in the book, the answer should be:
x^2 + 12x + 38
I don't see where this 12x came from >_>
Help? |
u foiled wrong. (x+5)^2 =/= x^2+25. It should be x^2+10x+25 |
how can you get three different values from (X+5)^2
? O_O
---------
the final answer at the back of the book said it was (X^2 + 12x + 3
so it can't be: X^2 + 10x + 25
(if that's what you meant) |
when u square(X+5)^2 caz (x+5)(x+5)
x^2+5x+5x+25. And the book answer is rite. I just pointed out the step u made a mistake in. The final part is x^2+5x+5x+25+2x + 10 + 3
=x^2 + 12x + 38
_________________
| Waxxup wrote: | What are Night Elves?
A girl group? |
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redslothx
Grandmaster Cheater Supreme
Reputation: 13
Joined: 27 Nov 2006
Posts: 1949
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| Posted: Sat Aug 29, 2009 3:47 pm Post subject: Re: Easy Math Problem (?) |
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| AverageAzn247 wrote: | | Ozymandias wrote: | | AverageAzn247 wrote: | | Ozymandias wrote: | I'm helping someone do their homework, and i ran into a problem that doesn't make any sense >_>
Here it is.
g(x) = x^2+2x+3
[g(x+5)]
assuming i remember this correctly, it should be:
g(x+5) = (x+5)^2 + 2(x+5) + 3
g(x+5) = X^2 + 25 + 2x + 10 + 3
g(x+5) = X^2 + 2x + 38
According to the answers in the book, the answer should be:
x^2 + 12x + 38
I don't see where this 12x came from >_>
Help? |
u foiled wrong. (x+5)^2 =/= x^2+25. It should be x^2+10x+25 |
how can you get three different values from (X+5)^2
? O_O
---------
the final answer at the back of the book said it was (X^2 + 12x + 3
so it can't be: X^2 + 10x + 25
(if that's what you meant) |
when u square(X+5)^2 caz (x+5)(x+5)
x^2+5x+5x+25. And the book answer is rite. I just pointed out the step u made a mistake in. The final part is x^2+5x+5x+25+2x + 10 + 3
=x^2 + 12x + 38 |
Oh...
thanks xD
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