Question

Dado a função f:R-R Definida por f(x)=2x²+X+1, Calcule: a) f(-2) b) f(0) c) f (1/3)

Answer 1

 f(x)=2x²+X+1, Calcule:

a) f(-2) =  2(-2)²+(-2)+1= 2.4-2+1 = 8 - 2 +1 = 7
b) f(0)   =  2(0)²+(0)+1= 2.0+0+1 = 0 + 0 +1 = 1
c) f (1/3)  =  2(1/3)²+(1/3)+1= 2/9+ 1/3 + 1 = (2+ 3 + 9)/9 = 14/9

Answer 2

a) f (-2) = 2 (-2)² + (-2) + 1
2. 4 - 2 + 1 = 7

b) f (0) = 2 (0)² + 0 + 1 = 1

c) f(1/3) = 2 . ( 1/3)² + 1/3 + 1
2. (1/6) + 1/3 + 1 
2/6 + 1/3 +1
2 + 2 +6    = 10 = 5        
     6            6     3