Answers

2014-07-27T20:04:51+08:00
F(x) = x² -7x + 1
f(3) = 3² - 7 . 3 + 1 =    -11
f(1) =  1² - 7 . 1 + 1=    - 5
f(x+1) =    (x+1)² - 7(x+1) +1
           = x²+2x+1-7x-1 + 1
           =  x²- 5x
0
f(3) = 3
f(3) = 3^2 - 7(3)
f(3) = 3^2 - 7(3) + 1
= 9 - 21 + 1
= 9 - 22
f(3) = -13

f(1) = 1^2 - 7(1)+1
= 1 - 7 + 1
= 1 - 8
f(x) = -7