anonymous
  • anonymous
Solve the equation. square root of 5x+1=6 square root of x-2 +7=-4 x2+7x+4=0 5x2=-15
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
1) x=7 2) x=123 3) x=-6.37, -.63 4) x=9
anonymous
  • anonymous
how did u get these answers
radar
  • radar
Would like to see how the answer to the 4th one was developed. when 9 is substitued in the equation: \[5(9)^{2}=-15\] \[(9)^{2}=-15/5=-3\] \[81\neq-3\]

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anonymous
  • anonymous
Yeah, my bad I read it wrong. It's actually 3i.
radar
  • radar
Gettin there...... how about \[i \sqrt{3}\]
anonymous
  • anonymous
\[5x ^{2}= -15\] \[X ^{2}= -15\div5=-3\] \[X=\sqrt{-3}\] \[X= i \sqrt{3}\]
anonymous
  • anonymous
Sorry about that, I'm new to this and I hadn't yet figured out the equation inserts.
radar
  • radar
What method did you use on number 3. Did you use quadratic formula?
anonymous
  • anonymous
Yes. First I put it in the equation and solved, simplifying tona decimal and rounding to the nearest hundredth. I also checked the zeroes on the graph.
anonymous
  • anonymous
5x^2 = -15 x^2 = -3 take the square root x = +- i sqrt(3)
radar
  • radar
Very good. lerachia is there any more questions?
radar
  • radar
blexting thanks , so their is two answers for number 4 \[i \sqrt{3}\]\[-i \sqrt{3}\]
radar
  • radar
lerachia, do you understand how quantum torch got those answers or do you care?
anonymous
  • anonymous
Yes, when you move an even power (either the numerator or denominator) there are multiple answers. I don't know how to write that with the equation thing yet though, but the rule applies, so thanks on my part as well.
radar
  • radar
good night all.

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