meow18
Add and simplify if possible:



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meow18
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\[3 \over x5 \] + \[5 \over x ^{2}25\]

gandalfwiz
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do u know what's special about x^2 25?

meow18
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No...

gandalfwiz
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it's something called "the difference of 2 perfect squares".

gandalfwiz
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all that means is x^2  a perfect square=(x+the square root)(xthe square root)

gandalfwiz
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so x^225 becomes (x+5)(x5)

meow18
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Oh

gandalfwiz
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k, so now u havedw:1324334896764:dw

gandalfwiz
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multiply the 3/x5 by (x+5)/(x+5)

gandalfwiz
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that gives us a common denominator

meow18
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So \[3x + 20 \over (x+5) (x5)\]

gandalfwiz
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yes!

gandalfwiz
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so busy concentrating on my drawing that I couldn't see what you posted :)

jimmyrep
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@meow  see the lcm question