Question

Dada a função definida por: f(x)=x2-3x+2
Calcule:

A) f(1)

B) f(-1)

C) f (-3)

D) f (3)​

Answer 1

A) f(x) quando x igual a 1

$f(1) = 1 {}^{2} - (3 \times 1) + 2 \\ f(1) = 1 - 3 + 2 \\ f(1) = 0$

B) f(x) quando x igual a -1

$f( - 1) = ( - 1 ) {}^{2} - (3 \times - 1) + 2 \\ f( - 1) = 1 + 3 + 2 \\ f( - 1) = 6$

C) f(x) quando x igual a -3

$f( - 3) = ( - 3) {}^{2} - (3 \times - 3) + 2 \\ f( - 3) = 9 + 9 + 2 \\ f( - 3) = 20$

D) f(x) quando x igual a 3

$f(3) = 3 {}^{2} - (3 \times 3) + 2 \\ f(3) = 9 - 9 + 2 \\ f(3) = 2$