1)(-7m)^2 (2m)^3 = 49m^2 * 8m^3 = 392m^5
2) 2a^2 -a(2a-5b) - b(2a-b) = 2a^2 - 2a^2 + 5ab - 2ab + b^2 = b^2 + 3ab
3)(x^2 + 3x + 2)(x+5) = x^3 + 3x^2 + 2x + 5x^2 + 15x + 10 =
= x^3 + 8x^2 + 17x +10
1)(-7m)^2 (2m)^3 = 49m^2 * 8m^3 = 392m^5
2) 2a^2 -a(2a-5b) - b(2a-b) = 2a^2 - 2a^2 + 5ab - 2ab + b^2 = b^2 + 3ab
3)(x^2 + 3x + 2)(x+5) = x^3 + 3x^2 + 2x + 5x^2 + 15x + 10 =
= x^3 + 8x^2 + 17x +10