Question

Qual valor de a, b, c?

Answer 1

Boa tarde

f(x) = ax² + bx + c

f(1) = a + b + c = 0
f(3) = 9a + 3b + c = 0
f(0) = c = 3

a + b = -3
9a + 3b = -3
3a + 3b = -9

9a - 3a = -3 + 9 = 6
3a = 6
a = 2

2 + b = -3
b = -5

f(x) = 2x² - 5x + 3 

a = 2
b = -5
c = 3