Question

2³¹ + 2³⁰ + 2²⁹ = x · 2²⁸
x=?

Answer 1

`2^(31)+2^(30)+2^(29)=\\ 2^(28)(2^3+2^2+2)=\\ 2^(28)(8+4+2)=\\ 2^(28)\cdot14\\\\ x=14`

Answer 2

`2^(31)+ 2^(30)+2^(29)=x*2^(28) \\\\ 2^(28)(2^3+2^2+2)=x*2^(28) \\\\ 2^3+2^2+2=x \\\\ x=8+4+2 \\\\ \boxed{x=14}`