anonymous
  • anonymous
use factoring to solve (x-1)^2-9=0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1353268350386:dw|
anonymous
  • anonymous
First at all you should develop the expression between parentesis.
anonymous
  • anonymous
is this using factoring? I need to use all methods

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anonymous
  • anonymous
isn't this extracting the square root
anonymous
  • anonymous
@viniterranova do u mean foil it?
anonymous
  • anonymous
If you quadratic trinomial for (x-1)^2 you will find. x^2+2x+1=9, so x^2+2x-8=0
anonymous
  • anonymous
and that's for the factoring method right???
anonymous
  • anonymous
Pay attetion. Just plug the x´s values +3 and -3 in the (x-1)^2=9. See if this is values are valid for the expression.
anonymous
  • anonymous
x^2+2x-8= 0 ; (x-4)(x+2)=0
anonymous
  • anonymous
well i just wanna be sure
anonymous
  • anonymous
Just solve the expression (x-4)(x+2)=0.
anonymous
  • anonymous
wait, im not there yet, so you move the 9 to the other side, and foil (x-1)^2 and I got x^2-2x+1?
anonymous
  • anonymous
Just pass the 8 for the first term of the equation and subtract it. and you got x^2+2x-8= 0
anonymous
  • anonymous
is thiscorrect
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anonymous
  • anonymous
isn't it a -2x
anonymous
  • anonymous
@Skaematik
anonymous
  • anonymous
Yes, it´s -2x. Sorry for my lack of attention. So, the expression is x^2-2x-8=0
anonymous
  • anonymous
and are the answers I got correct?
anonymous
  • anonymous
@Skaematik can u check my work
anonymous
  • anonymous
@viniterranova I saw ur work, I understand now

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