Question

Dado P(x) = ax2 + 2x – 1 Si: P(–2) = 7 entonces “a” vale

Answer 1

Respuesta:

a = 3

Explicación paso a paso:

P(x) = ax^2 + 2x – 1

P(-2) = a.(-2)^2 + 2. (-2) - 1

P(-2) = a.4 - 4 - 1

P(-2) = 4a - 5

7 = 4a - 5

7 + 5 = 4a

12 = 4a

12 : 4 = a

3 = a