If 3x - 1 = 11, what is the value of x 2 + x?
2007-02-28 17:06:23 · 8 answers · asked by Marty A 1 in Education & Reference ➔ Homework Help
3x-1 = 11
+1 +1
3x=12
-- --
3 3
x=4
So
x^2 +x (I think you mean x to the second power, not x times 2-please clarify your question!)
(4)^2+4
16+4
20
2007-02-28 17:18:53 · answer #1 · answered by salsera 5 · 0⤊ 0⤋
ANSWER
3x-1=11
3x= 11+1=12
x=12/3=4
x^2+x= 4*4 +4=16+4=20 Ans.
2007-03-01 01:24:48 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I have a brilliant Idea, use the symbolic method to find x:
3x - 1 = 11
+1 +1
3x=12
--- --- <-Divided by
3 3
-------------- Equals
x=4
so (4)2 +4 equals 12.
And please note you are getting this from an 8th grader who does the advanced homework.
Eriq... How do you get 10 from 8 + 4? You actually wrote it like (4)2 + 4 but still that equals 12 because (4)2 = 8
2007-03-01 01:30:02 · answer #3 · answered by Anonymous · 0⤊ 0⤋
You've got to be kidding me. Not your question, but the first answer. Let's try this again.
3x-1=11.
3x=12 (adding 1 to both sides)
x=4 (divide both sides by 3)
(4) 2 +(4) (Substitution)
8+4=12. That's TWELVE.
2007-03-01 01:20:11 · answer #4 · answered by infinity 2 · 0⤊ 0⤋
3x-1=11
so add 1 to both sides
3x=12
divide both sides by three
x=4
x2+x=12 not 10(like the first answerer said)
(4)2+(4)
4*2=8
8+4=12
2007-03-01 01:19:21 · answer #5 · answered by Wings Fan! 6 · 0⤊ 0⤋
Like this:
3x-1=11
+1 +1
------------
3x =12
3x/3 = 12/3
x=4
2007-03-01 01:15:13 · answer #6 · answered by irritatedinterrogator 3 · 0⤊ 0⤋
3x-1=11
3x=12
x=4
x2+x
(4)2+(4)
12 eriq above had it right... except for this last part.
2007-03-01 01:15:32 · answer #7 · answered by Hahn 2 · 0⤊ 0⤋
no.
3x-1=11
3x=12
x=4
x2+x
(4)2+(4)
10
2007-03-01 01:10:11 · answer #8 · answered by eriq p 4 · 1⤊ 1⤋