Question

3(3x-1)^2=21
solve the equation algebraically

Answer 1

This is actually 3(3x -1)(3x-1) = 21
All you need to do is expand the brackets then simplify.

Answer 2

x = 1.21525043702153

Answer 3

Make sure you then shift the 21 so the right side equating the equation to 0 to solve.

Answer 4

Can you do the rest?

Answer 5

my answer sheet said that the correct answer ia \[\sqrt{7}/3 \pm1/3\]

Answer 6

you can start be dividing both sides of the equation by 3
this will give you a new equations

(3x-1)^2 = 7

then square root both sides

3x-1 = 7^(1/2) [or root 7]

and 1 to both sides the divide by 3 gives you:

x= ((sqr.root 7) + 1)/3

which is
x = 1.21525043702153

Answer 7

oh ok'