anonymous
  • anonymous
For what value of x is the rational expression below undefined? 2x+4/x-7 A. 2 B. -2 C. -7 D. 7
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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kc_kennylau
  • kc_kennylau
\[\Large f(x)=\frac{2x+4}{x-7}\]
kc_kennylau
  • kc_kennylau
So, we can't divide by zero, right?
anonymous
  • anonymous
i believe so

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anonymous
  • anonymous
its undefined so that s what got to me
kc_kennylau
  • kc_kennylau
What value of \(\Large x\) would cause this problem?
anonymous
  • anonymous
so would i just plus it all in?
kc_kennylau
  • kc_kennylau
Well that's one way of solving the puzzle, you can do that
UsukiDoll
  • UsukiDoll
what values of x makes the fraction undefined?
anonymous
  • anonymous
but how would i know which one is undefined?
UsukiDoll
  • UsukiDoll
waitttt! look at the denominator first
anonymous
  • anonymous
and hi miku hahaha
UsukiDoll
  • UsukiDoll
focus on that denominator just that denominator
UsukiDoll
  • UsukiDoll
we have x -7 right ?
anonymous
  • anonymous
7?
anonymous
  • anonymous
-7 yea
anonymous
  • anonymous
wouldn't it have to be positive to be a undefined?
UsukiDoll
  • UsukiDoll
whoa... x - 7 what value of x makes it 0? it's like x-7 = 0 solve for x
UsukiDoll
  • UsukiDoll
yeah it has to be positive to be undefined
UsukiDoll
  • UsukiDoll
if you have a fraction like 1/0 that's undefined...we can't divide by 0
anonymous
  • anonymous
ok thanks :)
anonymous
  • anonymous
i got it well i understand it haha

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