anonymous
  • anonymous
.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Shayaan_Mustafa
  • Shayaan_Mustafa
use the factorization method. it is easy and shortcut too...
anonymous
  • anonymous
since you have the quadratic equation use this formula... \[\Large x_{1/2}\frac{-b\pm\sqrt{b^2-4ac}}{2a}\] a=1 b=-6 c=-27 just substitute and there you go...
Shayaan_Mustafa
  • Shayaan_Mustafa
i hope you know this method.

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amistre64
  • amistre64
assume it factors: (z+a)(z+b) = z^2 -6z -27 = 0 expand and compare z^2 +(a+b)z + ab = z^2 -6z -27
amistre64
  • amistre64
a+b = -6 ab = -27 if it plays nice then we need to find factors of -27 that add up to 6
Shayaan_Mustafa
  • Shayaan_Mustafa
\[\large x ^{2}+3x-9x-27=0\]\[\large x(x+3)-9(x+3)=0\]\[\large (x+3)(x-9)=0\]now separately call them equal to zero. good luck
anonymous
  • anonymous
I got it thanks everyone!
amistre64
  • amistre64
cool ;)
Shayaan_Mustafa
  • Shayaan_Mustafa
ever welcome. :D

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