Question

1) Dada a função f(x) = x² + 2x – 3, determine o valor numérico para:

a) f(0)


b) f(1)


c) f(2)


d) f(-2)


​

Answer 1

a) $f(0)=0^2+2\cdot 0-3$

$f(0)=0+0-3$

$f(0)=-3$

b) $f(1)=1^2+2\cdot 1-3$

$f(1)=1+2-3$

$f(1)=0$

c) $f(2)=2^2+2\cdot 2-3$

$f(2)=4+4-3$

$f(2)=5$

d) $f(-2)=(-2)^2+2\cdot (-2)-3$

$f(-2)=4-4-3$

$f(-2)=-3$