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anonymous
 one year ago
Solve 4r2 – 9 = 91.
A.
{± 3}
B.
{± 4}
C.
{± 5}
D.
{±6}
anonymous
 one year ago
Solve 4r2 – 9 = 91. A. {± 3} B. {± 4} C. {± 5} D. {±6}

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Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2add 9 to both sides divide both sides by 4 take the square root of each side

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2alright, so you added 9 to each side what's the next step?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2good, what's the next step?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2not quite, check the left side

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0im not sure what to do to the left side!

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2hint: the square root of a^2 = a so what is the square root of r^2?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2you're very close! when we take the square root of something, the answer can be either positive or negative, which is whydw:1432835682334:dw

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2now, what do you think the answer is?
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