Question

dada a função f:R->R por 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
23 - 3
20

Answer 2

Oi cristina

f(x) = x² + 2x

f(2) = 4 + 4 = 8

f(3) = 9 + 6 = 15

f(1) = 1 + 2 = 3

8 + 15 - 3 = 20