Представьте в виде многочлена
(5a-3c)(5a+3c)-(7c-a)(7c+a)=
(4b+10c)(10c-4b)+(-5c+2b)(5c+2b)=
1.(25a^2+15ac-15ca-9c^2)-(49c^2+7ca-7ca-a^2)=25a^2-9c^2-49c^2+a^2
1) (5a-3c)(5a+3c)-(7c-a)(7c+a) = 25a^2 - 9c^2 - (49c^2 - a^2) = 25a^2 - 9c^2 - 49c^2 + +a^2 = 26a^2 - 58c^2
2) (4b+10c)(10c-4b)+(-5c+2b)(5c+2b) = 100c^2 - 16b^2 + 4b^2 - 25c^2 = 75c^2 - 12b^2