Question

(2x-1)² -(x+1)² =9 por que​

Answer 1

que me des coronita

Explicación paso a paso:

(2x-1)^2-(x+1)^2=9

(4x^2+1)-(x^2+1)=9

4x^2-x^2=9-1-1

3x^2=7

x^2=7/3

x=raíz cuadrada de 2.3333

X=1.52752523

Answer 2

(2x-1)^2 - (x+1)^2 = 9

(2x-1+x+1)(2x-1-x -1) = 9

(3x) (x - 2) = 9

Dividimos la igualdad entre 3:

(3x/3)(x - 2) = 9/3

x(x - 2) = 3

x^2 - 2x = 3

x^2 - 2x - 3 = 0

Factorizamos:

(x - 3) (x + 1) = 0

Igualamos cada factor a cero:

x - 3 = 0
x = 3

x + 1 = 0
x = - 1

C.S. = {3, - 1}