Question

5x(x^2+7x-4)

Answer 1

do you know what distributing is?

Answer 2

no

Answer 3

then lets do a simple example:

we know that 3(8) = 24 right?

Answer 4

yeaa

Answer 5

then:

3(6+2) should equal 24 also right?

Answer 6

yes

Answer 7

good:

what we are going to do then is "distribute" the 3 thru the (6+2) like this:

3(6) + 3(2) = 24
18 + 6 = 24

24 = 24.

did you see what I did?

Answer 8

yes i understand that but i dont understand it when it has exponets and letters

Answer 9

fair enough..... those are simple rules as well..but lets use your problem:

5x(x^2+7x-4)

5x(x^2) + 5x(7x) + 5x(-4)

5xxx + 35xx + -20x

5x^3 + 35x^2 - 20x

did you see what happened? with the x's?

Answer 10

x^2 means you have 2 little x's

x^2 = xx

x^5 = xxxxx

x^9 = xxxxxxxxx

Answer 11

when we multiply "letters" we just tack on another one:

xx time xxx = xxxxx

x^2 times x^3 = x^5

Answer 12

okk

Answer 13

easy as ....pi :)

Answer 14

can you help me with a dividing one?

Answer 15

i can try...

Answer 16

5x3 +10x2 +20x/5x

Answer 17

is that 5x on the end the denominator for ALL of them? or just for the last one?

Answer 18

for all

Answer 19

ok....

for this we need to remember that anything over itself can be "canceled" out..... actually it turns to 1.

lets do the first term:

5xxx
----- anything that is the same can be canceled
5x

take off a 5x from top and bottom to get:

[5x]xx xx = x^2 does that makes sense?
------ =
[5x]

Answer 20

yes

Answer 21

2nd term:

10xx
----- what can we do to this one?
5x

Answer 22

is it gunna be 2x?

Answer 23

very good :)

Answer 24

and the last one?

20x
------
5x

Answer 25

4x?

Answer 26

4 is right, but we can cancel out an x from top and an x from bottom, so the answer becomes just:

4 do you see that?

Answer 27

yea i wasnt sure but i see it now

Answer 28

good job :) with practice youlll be better than me :)

Answer 29

haha thank you