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evy15 Group Title

use factoring to solve (x-1)^2-9=0

  • 2 years ago
  • 2 years ago

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  1. Skaematik Group Title
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    |dw:1353268350386:dw|

    • 2 years ago
  2. viniterranova Group Title
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    First at all you should develop the expression between parentesis.

    • 2 years ago
  3. evy15 Group Title
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    is this using factoring? I need to use all methods

    • 2 years ago
  4. evy15 Group Title
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    isn't this extracting the square root

    • 2 years ago
  5. evy15 Group Title
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    @viniterranova do u mean foil it?

    • 2 years ago
  6. viniterranova Group Title
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    If you quadratic trinomial for (x-1)^2 you will find. x^2+2x+1=9, so x^2+2x-8=0

    • 2 years ago
  7. evy15 Group Title
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    and that's for the factoring method right???

    • 2 years ago
  8. viniterranova Group Title
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    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.

    • 2 years ago
  9. viniterranova Group Title
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    x^2+2x-8= 0 ; (x-4)(x+2)=0

    • 2 years ago
  10. evy15 Group Title
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    well i just wanna be sure

    • 2 years ago
  11. viniterranova Group Title
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    Just solve the expression (x-4)(x+2)=0.

    • 2 years ago
  12. evy15 Group Title
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    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?

    • 2 years ago
  13. viniterranova Group Title
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    Just pass the 8 for the first term of the equation and subtract it. and you got x^2+2x-8= 0

    • 2 years ago
  14. evy15 Group Title
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    is thiscorrect

    • 2 years ago
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  15. evy15 Group Title
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    isn't it a -2x

    • 2 years ago
  16. evy15 Group Title
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    @Skaematik

    • 2 years ago
  17. viniterranova Group Title
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    Yes, it´s -2x. Sorry for my lack of attention. So, the expression is x^2-2x-8=0

    • 2 years ago
  18. evy15 Group Title
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    and are the answers I got correct?

    • 2 years ago
  19. evy15 Group Title
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    @Skaematik can u check my work

    • 2 years ago
  20. evy15 Group Title
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    @viniterranova I saw ur work, I understand now

    • 2 years ago
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