anonymous
  • anonymous
How exactly do I solve this equation? x2 - 12x = -36
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
\[x^2-12x+36=0\] now solve the quadratic
anonymous
  • anonymous
gives x=6 can yuo see why
precal
  • precal
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

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anonymous
  • anonymous
here yuo can factor the eqn, Do you know how to do this?
anonymous
  • anonymous
I don't understand how you got x = 6...
precal
  • precal
|dw:1338677027789:dw|
precal
  • precal
|dw:1338677062779:dw|
anonymous
  • anonymous
I'm sorry... I'm so confused. /:
anonymous
  • anonymous
Oh! Wait I think I get it!!
anonymous
  • anonymous
Took me a little bit :P Thank you both a ton!!
anonymous
  • anonymous
if you factorise the equation you get (x-6)(x-6) so when (x-6)=0 x=6 Do you see
anonymous
  • anonymous
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
precal
  • precal
|dw:1338678477379:dw|
precal
  • precal
|dw:1338678551861:dw|
anonymous
  • anonymous
wow that's the hard way! but it does always work. Try to factorise it before going through all this stress
precal
  • precal
just presenting multiple ways to solve it. Quadratic formula works 100% of the time, factoring does not
anonymous
  • anonymous
that's what I said :P

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