This discussion is closed.
Mittow
Badges: 0
Rep:
?
#1
Report Thread starter 16 years ago
#1
this formula?
(n+2)(n+1)
n2+3n +2
i am confused :confused:
0
way2go
Badges: 0
#2
Report 16 years ago
#2
(Original post by Mittow)
this formula?
(n+2)(n+1)
n2+3n +2
i am confused :confused:
(n+2)(n+1)
n*(n+1)+2*(n+1)
n^2+n+2n+2
n^2+3n+2

It's not that difficult, just think in steps. If you think you understand it by now, try to make:

(-n+3)(n-6)

Post the answer, so that we can see that you got it.

BTW: It's friday evening. Shouldn't we be doing something else?
0
fishpaste
Badges: 0
Rep:
?
#3
Report 16 years ago
#3
Multiply each 'term' in the first bracket by each 'term' in the other bracket, then add them up.

ie. n times n = n^2
n times 1 = n
n times 2 = 2n
2 times 1 is 2

add them up you get n^2 + n + 2n + 2 = n^2 + 3n + 2.
0
Mittow
Badges: 0
Rep:
?
#4
Report Thread starter 16 years ago
#4
thank you
i need to know y i Multiply each 'term' in the first bracket by each 'term' in the other bracket, then add them up.
its is really confusing
can anyone help?
0
ickle_katy
Badges: 11
Rep:
?
#5
Report 16 years ago
#5
(Original post by Mittow)
thank you
i need to know y i Multiply each 'term' in the first bracket by each 'term' in the other bracket, then add them up.
its is really confusing
can anyone help?

because you do. dont question just learn....

love Katy ***
0
Mittow
Badges: 0
Rep:
?
#6
Report Thread starter 16 years ago
#6
sorry!!!!
this is a question in a section of my course work!
0
Bhaal85
Badges: 9
Rep:
?
#7
Report 16 years ago
#7
(Original post by Mittow)
thank you
i need to know y i Multiply each 'term' in the first bracket by each 'term' in the other bracket, then add them up.
its is really confusing
can anyone help?
You are expanding the brackets e.g: Multiply out (1+X)(2+X):

1*2=2
1*X=1X
X*2=2X
X*X=X^2

Then collect like terms:

X^2+3X+2
0
fishpaste
Badges: 0
Rep:
?
#8
Report 16 years ago
#8
(Original post by way2go)
BTW: It's friday evening. Shouldn't we be doing something else?
..and then it dawned on me, god I suck.
0
Falguni
Badges: 15
Rep:
?
#9
Report 16 years ago
#9
(n+2)(n+1)
n*(n+1)+2*(n+1)
n^2+n+2n+2
n^2+3n+2

the reason why you multiply like this is because each number in the bracket must be multiplied by each number in the other bracket
you can also work it out by doing this:

n + 1
n l n^2 n
+ l
2 l 2n 2
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How are you feeling ahead of results day?

Very Confident (43)
8.08%
Confident (70)
13.16%
Indifferent (75)
14.1%
Unsure (137)
25.75%
Worried (207)
38.91%

Watched Threads

View All