Question

Решите срочно плиз!!!

Answer 1

1////////
1) x^2 +9x+ 9
2) 4a^2- 20ab + 25 b^2
3) z^2-4^2
4) 6n^2- 7m^2
2\\
1(x-5)(x+5)
2 (6m-10n)(6m+10n)
3 16y^2 -8y+y^2
4 (6a+2b)^2
4\\
1) x^2=64
x= +8, -8