Question

Нужна помощь с алгеброй​

Answer 1

$a)\;\;(3m+8)^2-(3m-8)(3m+8)=9m^2+48m+64-(9m^2-64)=\\\\=9m^2+48m+64-9m^2+64=48m+64+64=48m+128\\\\m=10\\\\ \boxed{48*10+128=480+128=608}\\\\\\\\b)\;\;(8m+3)^2-(8m-3)(8m+3)=64m^2+48m+9-(64m^2-9)=\\\\=64m^2+48m+9-64m^2-9=48m+9+9=48m+18\\\\m=5\\\\ \boxed{48*5+18=240+18=258}$