Question

Me ajudem, por favor

Answer 1

P(x)= ax² + b

P(2)= a.2² + b

5 = 4a + b

P(-1) = a.(-1) + b

2 = - a + b

4a + b = 5

-a + b = 2 (×-1)

4a + b = 5

a - b = -2

________+

5a = 3

a = 3/5

- a + b = 2

-3/5 + b = 2

b = 2 +3/5

b = 10 +3

_____

5

b = 13/5