# how do u explain...

Watch
This discussion is closed.
#1
this formula?
(n+2)(n+1)
n2+3n +2
i am confused 0
16 years ago
#2
(Original post by Mittow)
this formula?
(n+2)(n+1)
n2+3n +2
i am 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
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
#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
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
#6
sorry!!!!
this is a question in a section of my course work!
0
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
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
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

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

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

### Poll

Join the discussion

#### 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%