Whose method is correct?

Jaleel´s method is correct and the right option is option number D

Step-by-step explanation:

its because 2(x-2)

= 2x-4

note 2 is multiplied with both x and -2!

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

560

step-by-step explanation:

giggidy