Question

2+6+10+14.......+30=2x x^3​

Answer 1

2+6+10+14+.....+30=2 ori x la puterea 3
2(1+3+5+...+15)= 2*x³
1+3+...+15=x³
(1+2+3+4+..+15)-(2+4+6+...+14)=x³
15*16/2-2*7*8/2=x³
120-56=x³
x³=64
x=4

Acesta este un patrat perfect!