Write the general equation for the circle that passes through the points: (-1, 2)

(4, 2)

(- 3, 4)

You must include the appropriate sign (+ or -) in your answer. Do not use spaces in your answer.

x^2 + y^2 ___x ___y = 0

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

true? is that what you're asking or do you mean something else?

c. (3,2,6) is the answer.