Question

Si restamos 10 unidades al cuadrado de un número, el resultado coincide con el triple de dicho numero. ¿Cual es el numero busado?

Answer 1

The value of x is 5 that represents the searched number

Explanation:

Let us assume x be the number [^ 2] i.e. squared.

Now

x^2 -10 = 3x

This is a quadratic equation

x^ 2 - 3x - 10 = 0

x^2 - 5x + 2x - 10

x (x - 5) + 2(x - 5)

(x-5) (x + 2) = 0

x - 5 = 0 where x = 5 positive.

x + 2 = 0 where x = -2 negative.

Here we considered the positive

The value of x is 5 that represents the searched number