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ThisShouldFeelLikeFire Group Title

How exactly do I solve this equation? x2 - 12x = -36

  • 2 years ago
  • 2 years ago

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  1. kevsturge Group Title
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    \[x^2-12x+36=0\] now solve the quadratic

    • 2 years ago
  2. kevsturge Group Title
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    gives x=6 can yuo see why

    • 2 years ago
  3. precal Group Title
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    you can use the quadratic formula or you can factor it you can also, look at its graph and see where it crosses the x axis

    • 2 years ago
  4. kevsturge Group Title
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    here yuo can factor the eqn, Do you know how to do this?

    • 2 years ago
  5. ThisShouldFeelLikeFire Group Title
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    I don't understand how you got x = 6...

    • 2 years ago
  6. precal Group Title
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    |dw:1338677027789:dw|

    • 2 years ago
  7. precal Group Title
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    |dw:1338677062779:dw|

    • 2 years ago
  8. ThisShouldFeelLikeFire Group Title
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    I'm sorry... I'm so confused. /:

    • 2 years ago
  9. ThisShouldFeelLikeFire Group Title
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    Oh! Wait I think I get it!!

    • 2 years ago
  10. ThisShouldFeelLikeFire Group Title
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    Took me a little bit :P Thank you both a ton!!

    • 2 years ago
  11. kevsturge Group Title
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    if you factorise the equation you get (x-6)(x-6) so when (x-6)=0 x=6 Do you see

    • 2 years ago
  12. kevsturge Group Title
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    Here is how I practice factorising write the factorised end point i.e. (x+3)x+4) and expand the brackets to give\[x^2+4x+3x+12 \rightarrow x^2+7x+12\] now |I take \[x^2+7x+12\] and work backwards because I know it will definitely factorise

    • 2 years ago
  13. precal Group Title
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    |dw:1338678477379:dw|

    • 2 years ago
  14. precal Group Title
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    |dw:1338678551861:dw|

    • 2 years ago
  15. kevsturge Group Title
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    wow that's the hard way! but it does always work. Try to factorise it before going through all this stress

    • 2 years ago
  16. precal Group Title
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    just presenting multiple ways to solve it. Quadratic formula works 100% of the time, factoring does not

    • 2 years ago
  17. kevsturge Group Title
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    that's what I said :P

    • 2 years ago
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