Question

f ( x ) = x2- 4x + 1, calcule f ( -3 )+f ( 4 ).

Answer 1

f(-3)= (-3)^2-4×(-3)+1
9+12+1
22.

f(4)= 4^2-4×4+1
16-16+1
0+1
1.

Answer 2

f(x)= x2- 4x + 1      Substitua as incógnitas x por -3 e 4:

f(-3)= -3^2- 4*(-3) + 1= 22

f(4)=4^2- 4*4 + 1= 1