Question

1) Dada a função f(x) = 2x² + x - 2, determine:

a) f(5);

b) f(-2)​

Answer 1

a)

$f(5) = 2. {(5)}^{2} + (5) - 2$

$f(5) = 2.25 + 5 - 2$

$f(5) = 50 + 5 - 2$

$f(5) = 55 - 2$

$f(5 )= 53$

b)

$f( - 2) = 2. {( - 2)}^{2} + ( - 2) - 2$

$f( - 2) = 2.4 - 2 - 2$

$f( - 2) = 8 - 2 - 2$

$f( - 2) = 6 - 2$

$f( - 2) = 4$