2(3x-2)+4(x+1)=5x+30
solve for x
i get
2(3x-2)+4(x+1)=5x+30
6x - 4 + 4x + 4 = 5x+ 30
There is a -4 and a +4 on the same side of the equation now, with no brackets, they therefore cancel (-4 + 4 = 0)
6x + 4x = 5x+ 30
10x = 5x +30
10x-5x = 30
5x=30
X=6
thanks ever so much
2007-08-20 10:10:44 · 30 answers · asked by peppypop 2 in Science & Mathematics ➔ Mathematics
you are correct
2007-08-20 10:14:01 · answer #1 · answered by Anonymous · 0⤊ 0⤋
you are right and I give you another hint to be faster at calculating:
sum all factors with an x in it to the left side:
2*3x+4x-5x (while 5x comes from the right side)
= 5x
and then sum all the factors without an x in them to the right side:
30-(2*(-2)+4*1)=30
then you have 5x=30 which gives x=6
This is a good and quick way, you just go straight from left to right and catch all the x or as said all non-x Objects.
This makes "two" Operations in one step and all your Equation is only one step from x=..
Pitfalls to that method are large embraced terms with a lot of + and - eg. -(a+(b-c(d-f(x+3)))) where you should really eliminate braces first.
2007-08-20 10:26:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
that looks right. but to check any algerbra problem yourself reensert what you find for an variable in the oridganl equation so
2(3(6)-2)+4(6+1)=5(6)+30
2(18-2)+4(6+1)=30+30
2(16)+4(7)=60
32+28=60
60=60
and if you come to the same turms, like that, you solved it right
2007-08-20 10:18:43 · answer #3 · answered by hunter_o_redheads 3 · 0⤊ 0⤋
Excellent work
Nice to see you have actually displayed clearly your methodology and in an examination, you will gain some marks for that even if you make an error.
Keep up the good work - Algebra was the only section of Mathematics that I ever enjoyed.
2007-08-20 10:24:02 · answer #4 · answered by Briu1970 3 · 0⤊ 0⤋
Looks good to me. If you substitute 6 for X in the original equation you arrive at 60 = 60
How good is that!!
John
2007-08-20 10:15:44 · answer #5 · answered by Anonymous · 0⤊ 0⤋
You can check the answer for yourself. Just substitute the number 6 for each x in your initial equation, then work it out.
2007-08-21 04:46:39 · answer #6 · answered by Anonymous · 0⤊ 1⤋
this is correct, to check you could substitute x = 6 into the original equation.
2007-08-20 10:14:16 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Yip thats correct, well done I remember it took a while for me to catch on to alegbra
2007-08-20 10:27:43 · answer #8 · answered by cookie 2 · 0⤊ 0⤋
heck yeah you're right!
remember-- you can always substitute 6 for x in the original equation to check your work.
2007-08-20 10:17:25 · answer #9 · answered by Anonymous · 0⤊ 0⤋
You go Carol Vorderman.
2007-08-20 22:48:52 · answer #10 · answered by The Fresh Prince 4 · 0⤊ 0⤋
Working looks good and answer is correct.
2007-08-20 10:57:17 · answer #11 · answered by Anonymous · 0⤊ 0⤋