Question

dada a função:
$f(x)=x²+2x$
determine o valor de:
$f(2)+f(3)-f(1)$
​

Answer 1

f(x) = x² + 2x

f(2) = 2² + 2 . 2

f(2) = 4 + 4

f(2) = 8

f(3) = 3² + 2 . 3

f(3) = 9 + 6

f(3) = 15

f(1) = 1² + 2 . 1

f(1) = 1 + 2

f(1) = 3

f(2) + f(3) - f(1) = 8 + 15 - 3 = 20