Question

i'm in algebra 1 barely. & I need help with this problem. given that, 2(x-1)=3(5+x)-12, what is the value of 3x to the second power+2?

Answer 1

First you'll have to look for the value of x
So continuing from your equation,
\[2x-2=15+3x-12\]\[x=-5\]
Then substitute your value of x into your given question which is
\[3x^{2}+2\]\[=3(-5)^{2}+2\]\[=77\]

Answer 2

that's not what I got. I got x=5.

Answer 3

hmmm i too made a mistake it is 3x^2+2
i took (3x)^(+2)

Answer 4

next time to help make sense of your problem use parenthesis. I was under the impression it was x^2 +another 2 making it 3x^4. But first answer is right

Answer 5

@alyssa: You'll get the same result which is 77 cause square of 5 and square of -5 are both 25.

@sheg: Really? Cause that wasn't how we usually pronounce it so perhaps I'm wrong. :P

Answer 6

multiply out using the distributive law
\[2x-2=15+3x-12\]
combine like terms
\[2x-2=3+3x\] subtract 2x from both sides
\[-2=3+x\] subtract 3 from both sides
\[-5=x\]

Answer 7

now if it is
\[3x^2\] you get
\[3\times (-5)^2=3\times 25=75\]

Answer 8

and if it is
\[3x^2+2\] you get
\[75+2=77\] but if it is
\[(3x)^2+2\] then you get something else

Answer 9

wait, what does " ^ " stand for? o:

Answer 10

is the problem
\[3x^2\]?

Answer 11

3x^2 means
\[3x^2\]

Answer 12

help me earn medals? :D
and thanks for your help. but I still want to know what "^" stands for.

Answer 13

We write that as it's how we key in the power of a number into the calculator