Mathematics
22 Online
OpenStudy (anonymous):
Will give Medallll!
Simplify this expression:
x2+x
-----
x2-1
Will give Medallll!
Thanks :)
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geerky42 (geerky42):
Try to factor numerator and denominator.
OpenStudy (anonymous):
how?
I suck at math :/ :(
OpenStudy (anonymous):
thanks :)
geerky42 (geerky42):
Let do numerator first.
\(x^2 + x\)
What do both terms have in common that you can factor out?
OpenStudy (anonymous):
x
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OpenStudy (anonymous):
so x (x+1)
OpenStudy (anonymous):
and denominator is 1(x+1) right?
geerky42 (geerky42):
Right.
No, denominator is not 1(x+1)
geerky42 (geerky42):
Denominator is in form \(a^2 - b^2\), which can be factored into \((a+b)(a-b)\)
in this case, a is x and b is 1
OpenStudy (anonymous):
oh yaaaaa
THANKS!
Sry but do u know this question
3x X x-2
---- -----
x2-4 x3
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geerky42 (geerky42):
factor left denominator
geerky42 (geerky42):
\(x^2 - 4\)
OpenStudy (anonymous):
x2 and 2 squared
geerky42 (geerky42):
right
geerky42 (geerky42):
So it can be factored to (x-2)(x+2)
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OpenStudy (anonymous):
yep :)
geerky42 (geerky42):
so you got (x-2) cancel out
geerky42 (geerky42):
that's all, I believe
OpenStudy (anonymous):
oh thanks :)
Really appreciate it :)
geerky42 (geerky42):
wait no, x^3 = x(x^2)
you can cancel x as well