Evaluate –23 – |2 + 4z| if z = –5.

-41

General Formulas and Concepts:

Order of Operations: BPEMDAS

Absolute Value, symbol |x|, makes any negative number positive

Step-by-step explanation:

Step 1: Define

-23 - |2 + 4z|

z = -5

Step 2: Solve

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

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