Question

Solve 4r2 – 9 = 91.

A.
{± 3}

B.
{± 4}

C.
{± 5}

D.
{±6}

Answer 1

4r^2-9=91?

Answer 2

add +9 for both sides
4r^2-9 +9=91+9

Answer 3

yes

Answer 4

4r^2=100 r^2=25 r=+-5

Answer 5

1. A 9 to both sides:\[4r^2−9+9=91+9 = 4r^2=100\]

Answer 6

so c? @ssssss

Answer 7

2. Divide both sides by 4:\[\frac{ 4r^2 }{ 4 } = \frac{ 100 }{ 4 }\]

Answer 8

Yes))

Answer 9

Yes, C is Correct :)

Answer 10

you r left with r2 and 25 @KendrickLamar2014

Answer 11

Yes, then u take the square root of 25

Answer 12

r^2=100/4=25
r=+-5

Answer 13

is 5 so c?

Answer 14

Which equals: r = 5 or r = -5

Answer 15

C is
o
r
r
e
c
t

Answer 16

yes

Answer 17

Solve (z + 6)2 = 5.

A.


B.


C.


D.

Answer 18

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