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evy15

  • 3 years ago

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

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  1. Skaematik
    • 3 years ago
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    |dw:1353268350386:dw|

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

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

  4. evy15
    • 3 years ago
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    isn't this extracting the square root

  5. evy15
    • 3 years ago
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    @viniterranova do u mean foil it?

  6. viniterranova
    • 3 years ago
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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

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

  8. viniterranova
    • 3 years ago
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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.

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

  10. evy15
    • 3 years ago
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    well i just wanna be sure

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

  12. evy15
    • 3 years ago
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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?

  13. viniterranova
    • 3 years ago
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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

  14. evy15
    • 3 years ago
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    is thiscorrect

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

  16. evy15
    • 3 years ago
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    @Skaematik

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

  18. evy15
    • 3 years ago
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    and are the answers I got correct?

  19. evy15
    • 3 years ago
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    @Skaematik can u check my work

  20. evy15
    • 3 years ago
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    @viniterranova I saw ur work, I understand now

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