Use the binomial theorem to expand (4-2z)^3

(

t

+

w

)

4

=

t

4

+

4

t

3

w

1

+

6

t

2

w

2

+

4

t

1

w

3

+

w

4

Explanation:

First, you should get to know Pascal's triangle. Here's a small portion of it up to 6 lines. Basically you're just adding the numbers that are beside each other, then writing the sum below them. (For example,  

1

+

2

in the third line equals to  

3

in the fourth line.) If you want a better explanation for that, feel free to do some more research on it.

its kind of blurry. can you put a clearer pic?

step-by-step explanation: