^ - степень
#1
a) 2c^2 + 7c = c (2c + 7)
б) 4y^2 - 28 y = 4y (y - 7)
в)24x^2 y^2 - 6y^2 = 6y^2 (x^2 - 1)
г)3x^4 + 15x^2 + 9x = 3x(x^3 + 3x + 3)
#2
a)x(b-c) + 7b- 7c = x(B-C ) + 7 (b-c) = (x + 7) (b - c)
б)3x - 3y + ax -ay = 3 (x - y) + a (x - y) = (3 + a) (x - y)