Question

А)(7b-c²)(7b+c²)=? Б)(6b²+a)²=? В)(5a+b)²*(5a-b)²=?.

Answer 1

а). (7b-c^2)*(7b+c^2)=49b^2-c^4; б). (6b^2+a)^2=36b^4+12ab^2+a^2.  в). не знаю