Question

Presiso calcular essa raiz da equacao :
"X+x/2+x/4-x/8=21-3/2"
(A)9
(B)10
(C)11
(D)12
(E)13
Obs: preciso de conta por favor:-)

Answer 1

x+x/2+x/4-x/8 = 21 - 3/2
8x + 4x + 2x - x = 168 - 12
13x = 156
x = 156/13
x = 12 (D)