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# If the expression 3x-4 has a vaule of -3 for some vaule of x then what is the vaule of the expression (3x-4)^2+6x-8for the the same vaule of x

Id really appreciate if someone knew the answerðŸ˜–

### 3 Answers by Expert Tutors

4.9 4.9 (63 lesson ratings) (63)
1
Lani, you need to go to your teacher for help and/or find a tutor. We can't do all of your hw for you.

3x - 4 = -3
3x - 4 + 4 = -3 + 4
3x = 1
3x/3 = 1/3
x = 1/3

You are already given that 3x - 4 = -3, so (-3)= 9. Since x = 1/3...

9 + 6(1/3) - 8 = 9 + 2 - 8 = 3
David W. | Experienced ProfExperienced Prof
4.4 4.4 (47 lesson ratings) (47)
0
Given:  3x-4 = -3
That means:  6x-8 = -6

So, (-3)2-6 = 9-6 = 3                   [note: not all problems will have such easy substitution]
Arturo O. | Experienced Physics Teacher for Physics TutoringExperienced Physics Teacher for Physics ...
5.0 5.0 (66 lesson ratings) (66)
0
First, solve for x in

3x - 4 = -3.

(Can you do that?)

Then substitute the result into

(3x - 4)2 + 6x - 8,