Una función cuadrática es de la forma f(x)=ax^2+bx+c, donde a, b y c son número reales y a es diferente de cero. De acuerdo con este enunciado cual no es una función cuadrática. * f(x)=3x^2+12x+5 f(x)=x^2+x+1 f(x)=5x^2+8x f(x)=5x+3

option (4)

Step-by-step explanation:

The general form of a quadratic function is given by :

Where a,b and c are real numbers and a is nonzero.

Option (1)

It is a quadratic function. Here, a = 3, b = 12 and c = 5

Option (2),

It is a quadratic function where a = 1, b = 1 and c =1

Option (3),

It can also be written as :

It is a quadratic function where a = 5, b = 8 and c = 0

Option (4),

It can also be written as :

f(x) = 5x + 3

It is a linear function. It is not a quadratic function.

Hence, option (4) is the correct option. It is not a quadratic function.

the answer is d

step-by-step explanation: