Question

Dau coroana (x+5)la a 3-a -x-5=(x+4)(x+5)(x+6)

Answer 1

$( x+5)^{3}$- X-5= (X+4)+ (X+5)+ (X+6)
$x^{3} + 5^{3}$ -X-5 = X (4+5+6)
$x^{3}$+ 120-X= X 15
$x^{3}$ +120= 16x
$x^{3}$ :16 x =120
$x^{3}$ = 7,5