Question

упростите:49n^2-36m^2-(7n-5)(5+7n)-25
заранее большое спасибо

Answer 1

49n^2-36m^2-(49n^2-25)-25=49n^2-36m^2-49n^2+25-25=-36m^2

Answer 2

$49n^2-36m^2-(49n^2-25)-25=49n^2-36m^2-49n^2+25-25=$$-36m^2$