Question

Сократите дробь. (b^14-b^7+1)/(b^21+1)

Answer 1

= b^14-b^7+1/(b^7+1)×(b^14-b^7+1) = 1/b^7+1

Answer 2

$frac{b ^{14} -b ^{7}+1 }{b ^{21}+1 } = frac{b ^{14} -b ^{7}+1 }{(b ^{7}) ^{3} +1 ^{3} }= frac{b ^{14}-b ^{7} +1 }{(b ^{7}+1)(b ^{14} -b^{7} +1 )} = frac{1}{b ^{7}+1 }$