anonymous
  • anonymous
Solve –3x2 + 30x – 90 = 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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Mertsj
  • Mertsj
Factor out -3 first.
anonymous
  • anonymous
x = -30+ 30i / -6 = 5 - 30i and x= 5+30i
Mertsj
  • Mertsj
\[-3(x^2-10x+30)=0\]

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anonymous
  • anonymous
the roots will be complex...it can't be factorized..
Mertsj
  • Mertsj
\[x=\frac{10\pm \sqrt{100-4(30)}}{2}=\frac{10\pm \sqrt{100-120}}{2}\]
Mertsj
  • Mertsj
\[x=\frac{10\pm \sqrt{-20}}{2}=\frac{10\pm 2\sqrt{5}i}{2}=5\pm \sqrt{5}i\]
anonymous
  • anonymous
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Mertsj
  • Mertsj
You forgot to divide the 10 by 2 lilmagda105
anonymous
  • anonymous
no i gave you the options of answers
Mertsj
  • Mertsj
There is only one answer on that post and it is incorrect.
Mertsj
  • Mertsj
The answers I gave you are correct.
anonymous
  • anonymous
|dw:1332353586583:dw| is that the answer
Mertsj
  • Mertsj
|dw:1332353832043:dw|
Mertsj
  • Mertsj
Those are the answers.
anonymous
  • anonymous
okay thanks
Mertsj
  • Mertsj
yw
anonymous
  • anonymous
Its been 3 years but I'm sorry Mertsj, but you are wrong. lilmagda105 is right. its not 5i its i|dw:1446518157342:dw|

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