Respostas

2013-03-10T01:13:02-03:00

Letra A= x = 3 e y = -5 ---> -5 = a.3² + b.3 + c
-5 = a.3² + b.3 + c
-5= 9a + 3b + 5
-5= 9(-6 - b) + 3b + 5
0 = -54 - 9b + 3b
0 = - 6b
b = -6

 LETRA B:

x =6  e y = 15 ---> 15 = a.6² + b.6 + c
15 = a.6² + b.6 + c
15= 36a + 6b + 5
15= 36(-6 - b) + 6b + 5
20=-216 - 36b + 6b
236= -42b
b = -42+236

b=430

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