U3.L1.HW: Functions & Function Notation: Question 19

Question

How would I compute the following?

Suppose f (x) = x2 - 5x + 1. Compute the following:

A.) f (-3) + f (4) = 

B.) f( -3) - f (4) = 

Answer 1

f(x) = x^2 +5x -1

f(-3) + f(4) = 9 -15 -1 + 16 +20 -1 = 28

f(-3) - f(4) = 9-15-1 - (16+20-1) = -7 - (35) = - 42

(no guarantees on errorless arithmetic, but it's the basic method.

get 2 extra points if you find a mistake above, redeemable for one free donut

at Dunkin Donuts in the year 3000)