По формуле разности квадратов
1) 9 - (2с - 1)^2 =3^2-(2c-1)^2=(3-2c+1)(3+2c-1)=(4-2c)(2+2c).
2) (a^2 + 4)^2 - 16a^2 = (a^2 + 4)^2 - (4a)^2 =(a^2+4-4a)(a^2+4+4a).
3) (x^2 + 9)^2 - 36x^2 =(x^2 + 9)^2 - (6x)^2=(x^2 + 9-6x)(x^2 + 9+6x).
4) 2a^2b - 3a + 10 ab^2 - 15b=(2a^2b - 3a) + (10 ab^2 - 15b)=a(2ab - 3) + 5b(2ab -3)=(2ab-3)(a+5b)
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По формуле разности квадратов
1) 9 - (2с - 1)^2 =3^2-(2c-1)^2=(3-2c+1)(3+2c-1)=(4-2c)(2+2c).
2) (a^2 + 4)^2 - 16a^2 = (a^2 + 4)^2 - (4a)^2 =(a^2+4-4a)(a^2+4+4a).
3) (x^2 + 9)^2 - 36x^2 =(x^2 + 9)^2 - (6x)^2=(x^2 + 9-6x)(x^2 + 9+6x).
4) 2a^2b - 3a + 10 ab^2 - 15b=(2a^2b - 3a) + (10 ab^2 - 15b)=a(2ab - 3) + 5b(2ab -3)=(2ab-3)(a+5b)