anonymous
  • anonymous
7sqrt-20+sqrt-45
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
\[7\sqrt{-20}+\sqrt{-45}\] need help with the steps, please and thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Compassionate
  • Compassionate
Okay, so what are the multiples of -20?
anonymous
  • anonymous
Steps? Which steps? You haven't even said what's required.

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anonymous
  • anonymous
The steps to get the answer lol
anonymous
  • anonymous
What answer? To which question?
anonymous
  • anonymous
\[7\sqrt{-20}+\sqrt{-45}=?\]
anonymous
  • anonymous
root(-1) is i. So you have 7root(20)i + root(45)i root(20) = root (4) x root (5) root(45) = root (9) x root(5)
anonymous
  • anonymous
ok, then what? do I make it 2root2*root*5, and 3root3*root5
mathstudent55
  • mathstudent55
|dw:1370220305720:dw|
anonymous
  • anonymous
4 and 9?
mathstudent55
  • mathstudent55
right
mathstudent55
  • mathstudent55
|dw:1370221556180:dw|
anonymous
  • anonymous
ok I understand that part, but now what?
anonymous
  • anonymous
simplify?
anonymous
  • anonymous
Yes, what a roots of 4 and 9?
anonymous
  • anonymous
2 and 3
mathstudent55
  • mathstudent55
Now sqrt(4) and sqrt(9) are just numbers right
anonymous
  • anonymous
yea
mathstudent55
  • mathstudent55
|dw:1370221937947:dw|
anonymous
  • anonymous
17 root 5
mathstudent55
  • mathstudent55
Don't forget the i
anonymous
  • anonymous
17i root 5
anonymous
  • anonymous
yay thanks so much!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
mathstudent55
  • mathstudent55
|dw:1370222096359:dw|
mathstudent55
  • mathstudent55
wlcm
anonymous
  • anonymous
yup i got the same
anonymous
  • anonymous
ty!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
anonymous
  • anonymous
!
mathstudent55
  • mathstudent55
wlcm

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