Question

2 la puterea x-2 + 2 la puterea x-3 + 2 la puterea x-4= 448

Answer 1

2^x-2 + 2^x-3 + 2^x-4= 448

2^x/4 + 2^x/8 + 2^x/ 16= 448

4× 2^x+ 2× 2^x + 2^x /16= 448

2^x( 4+2+1) = 7168

2^x × 7 = 7168

2^ x= 1024 => 2^x = 2^ 10 => X= 10

coroană? ;)