Question

Se f(x)=2x²+1; então f(1)-f(-2)+f(3) é igual à:

Answer 1

f(x)= 2x² + 1; então f(1) - f(-2) + f(3)

f(1) = 2.1² + 1
f(1) = 2.1 + 1
f(1) = 2 + 1
f(1) = 3

f(-2) = 2.(-2)² + 1
f(-2) = 2.4 + 1
f(-2) = 8 + 1
f(-2) = 9

f(3) = 2.3² + 1
f(3) = 2.9 + 1
f(3) = 18 + 1
f(3) = 19

= f(1) - f(- 2) + f(3)
= 3 - 9 + 19
= - 6 + 19
= 13

Resp.: 13