Respuesta :

Answer:

4

Step-by-step explanation:

[tex]f(x) = 5( {x}^{2} - 4x + ) + 15 \\ = 5( {x}^{2} - 4x + 4) + 15 \\ = 5( {x}^{2} - 4x + {2}^{2} ) + 15 \\ = 5 (x - 2)^{2} + 15 [/tex]