Add or subtract (4x^2-2x-1)-(-3x^3+2)

HEYYAA

Step-by-step explanation:4x^2-2x-1-(-3x^3+2)

so as to opent the bracket the signs should be changed

so it becomes4x^2-2x-1+3x^3-2=+3x^3+4x^2-2x-3 i sthe answer

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

i used to know but i learned it a long time ago sorry

step-by-step explanation: