Question

Resolução
f(x) = x2 - 7x + 12
a) f(-5) = (-5)2 – 7.(-5) + 12 = 25 + 35 + 12 = 72
b) f(3) = (3)2 – 7. (3) + 12 = 9 - 21 + 12 = 0
c) f(-4) = (-4)2 – 7.(-4) + 12 = 16 + 28 + 12 = 56
63
d) f(-5) = (-1) -7.(-1) + 12 = = (1) + (-) + 12 =
+ 12 = (-1) + (%) + ()​

Answer 1

f(x) = x2 - 7x + 12

a) f(-5)

= (-5)2 – 7.(-5) + 12

= 25 + 35 + 12

= 72 ✅

b) f(3)

= (3)2 – 7. (3) + 12

= 9 - 21 + 12

= 0 ✅

c) f(-4)

= (-4)2 – 7.(-4) + 12

= 16 + 28 + 12

= 56 ✅

d) f(-1)

= (-1) -7.(-1) + 12

= - 1 + 7 + 12

= 18