Respostas

2014-01-11T11:39:22-02:00
f(x) = - 7x + 12
f(0) = - 7 * 0 + 12
= 0 + 12
= 12
2014-01-11T11:40:31-02:00
Basta substituirmos o x pelo 0

f(0) = -7.0+12
f(0) = 0 + 12
f(0) = 12