Question

(2.x + 1) • (2•x + 2) • (2•x+3) = 720

Answer 1

Răspuns:

• x = 7/2

Explicație pas cu pas:

(2.x + 1) • (2•x + 2) • (2•x+3) = 720

Observam ca avem produs de 3 numere consecutive

720 = 2 × 2 × 2 × 2 × 3 × 3 × 5 =  8 × 9 × 10

(2x + 1) (2x + 2) (2x + 3) =  8 × 9 × 10

2x + 1 = 8  

2x = 7  

x = 7/2

2x + 2 = 9          

2x = 7        

x = 7/2

2x + 3 = 10  

2x = 7      

x = 7/2