anonymous
  • anonymous
Solve 4r2 – 9 = 91. A. {± 3} B. {± 4} C. {± 5} D. {±6}
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
4r^2-9=91?
anonymous
  • anonymous
add +9 for both sides 4r^2-9 +9=91+9
anonymous
  • anonymous
yes

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anonymous
  • anonymous
4r^2=100 r^2=25 r=+-5
KendrickLamar2014
  • KendrickLamar2014
1. A 9 to both sides:\[4r^2−9+9=91+9 = 4r^2=100\]
anonymous
  • anonymous
so c? @ssssss
KendrickLamar2014
  • KendrickLamar2014
2. Divide both sides by 4:\[\frac{ 4r^2 }{ 4 } = \frac{ 100 }{ 4 }\]
anonymous
  • anonymous
Yes))
KendrickLamar2014
  • KendrickLamar2014
Yes, C is Correct :)
anonymous
  • anonymous
you r left with r2 and 25 @KendrickLamar2014
KendrickLamar2014
  • KendrickLamar2014
Yes, then u take the square root of 25
anonymous
  • anonymous
r^2=100/4=25 r=+-5
anonymous
  • anonymous
is 5 so c?
KendrickLamar2014
  • KendrickLamar2014
Which equals: r = 5 or r = -5
KendrickLamar2014
  • KendrickLamar2014
C is o r r e c t
anonymous
  • anonymous
yes
anonymous
  • anonymous
Solve (z + 6)2 = 5. A. B. C. D.
KendrickLamar2014
  • KendrickLamar2014
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