anonymous
  • anonymous
Solve 4r2 – 9 = 91. A. {± 3} B. {± 4} C. {± 5} D. {±6}
Mathematics
jamiebookeater
  • jamiebookeater
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Vocaloid
  • Vocaloid
add 9 to both sides divide both sides by 4 take the square root of each side
anonymous
  • anonymous
4r^2=100
anonymous
  • anonymous

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Vocaloid
  • Vocaloid
alright, so you added 9 to each side what's the next step?
anonymous
  • anonymous
r^2=25
Vocaloid
  • Vocaloid
good, what's the next step?
anonymous
  • anonymous
r^2=5
anonymous
  • anonymous
Vocaloid
  • Vocaloid
not quite, check the left side
anonymous
  • anonymous
im not sure what to do to the left side!
Vocaloid
  • Vocaloid
hint: the square root of a^2 = a so what is the square root of r^2?
anonymous
  • anonymous
r=5
Vocaloid
  • Vocaloid
you're very close! when we take the square root of something, the answer can be either positive or negative, which is why|dw:1432835682334:dw|
Vocaloid
  • Vocaloid
now, what do you think the answer is?
anonymous
  • anonymous
c?
Vocaloid
  • Vocaloid
yup, excellent job ~

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