Question

(m+3)(m-3)-m(m+1)
4n(n+4)-(4-n)(4+n)
(5a+b)(b-5a)+25a(a-b)
-2x(2x-m)+(2x-3m)(2x+3m)

Answer 1

$m^{2} -3m+3m-9- m^{2} -m=-m-9$
$4 n^{2} +16n-16-4n+4n+ n^{2} =5 n^{2} +16n-16$
$5ab-25 a^{2} + b^{2} -5ab+25 a^{2} -25ab= b^{2} -25ab$
$- 4x^{2} +2mx+4 x^{2} +6mx-6mx-9 m^{2} =2mx-9 m^{2}$

Answer 2

"nj jndtn

Answer 3

Это ответ