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Mathematics 22 Online
OpenStudy (anonymous):

Will give Medallll! Simplify this expression: x2+x ----- x2-1 Will give Medallll! Thanks :)

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

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

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)

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

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