Un numero mas su doble es igual a su mitad mas quince ¿cual es el numero ?

For this case we have:

"One number plus its double equals its half plus fifteen, what is the number?"

x: Let the variable that represents the unknown number

According to the statement we have:

"One number plus its double" is represented as:

"Its half plus fifteen" is represented as:

Then we have the following expression:

We solve the equation:

So the number is 6

720

step-by-step explanation:

first i did work 2nd i did work and 3rd i did work

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a