Ineed i totally forgot how to do it

Changes made to your input should not affect the solution:

 (1): "n2"   was replaced by   "n^2". 

 3.1     Pull out like factors :

   5n2 + 10n + 20  =   5 • (n2 + 2n + 4) 

 3.2     Factoring  n2 + 2n + 4 

The first term is,  n2  its coefficient is  1 .
The middle term is,  +2n  its coefficient is  2 .
The last term, "the constant", is  +4 

Step-1 : Multiply the coefficient of the first term by the constant   1 • 4 = 4 

Step-2 : Find two factors of  4  whose sum equals the coefficient of the middle term, which is   2 .

the answer is b i just did that

step-by-step explanation:

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0