Question

1-Dada a função f(x) = x² + 2x – 3, calcule: ( 0,5 cada )

a) f(0)=


b) f(1)=


c) f(2)=


d) f(-2)

Answer 1

Resposta:

f(x) = x² + 2x – 3

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

b) f(1)= 1+2-3=0

c) f(2)=2²+2*2-3 =8-3=5

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

Answer 2

Oie, tudo bom?

$f(x) = x {}^{2} + 2x - 3$

a)

$f(0) = 0 {}^{2} + 2 \: . \: 0 - 3 \\ f(0) = 0 + 0 - 3 \\ f(0) = 0 - 3 \\ \boxed{f(0) = - 3}$

b)

$f(1) = 1 {}^{2} + 2 \: . \: 1 - 3 \\ f(1) = 1 + 2 - 3 \\ f(1) = 3 - 3 \\ \boxed{f(1) = 0}$

c)

$f(2) = 2 {}^{2} + 2 \: . \: 2 - 3 \\ f(2) = 4 + 4 - 3 \\ f(2) = 8 - 3 \\ \boxed{f(2) = 5}$

d)

$f( - 2) = ( - 2) {}^{2} + 2 \: . \: ( - 2) - 3 \\ f( - 2) = 4 - 4 - 3 \\ f( - 2) = 0 - 3 \\ \boxed{f( - 2) = - 3}$

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