Question

What are the solutions to the equation 9x2 = 49, rounded to the nearest tenth?

A.
2.3, –2.3

B.
5.4, –5.4

C.
7, –7

D.
21, –21


I think it's C.

Answer 1

isn't it 7x2=49????

Answer 2

first divide both sides of the equation by 9 to get the values of x^2
then take the square root

Answer 3

x^2 = 49/9

x = +/- square root of 49/9

Answer 4

no, it should be x2=49 because otherwise we don't see the match cases.

Answer 5

= sqrt49 / sqrt9 = 7/3

Answer 6

divide 7 by 3 - what do you get?

Answer 7

2.3

Answer 8

and ?

Answer 9

- the negative of 2.3

Answer 10

Oh yeah, thank you.

Answer 11

sorry i should have said +/- 7/3

Answer 12

yw

Answer 13

It's fine. c: