а) (-3y^2)^25y^4 = 9y^4 5y^4 = 45y^8б) (2a-1)^2 + (2a+1)*(2a-1) = (2a-1)(2a-1) + (2a+1)(2a-1) = (2a-1)^2 + 2a(2a-1) - 1 = 4a^2 - 4a + 1 + 4a - 2 - 1 = 4a^2 - 1
а) 36b-by^2 = 36b - by^2 = b(36 - y^2) = b(6+y)(6-y)б) 5y^2-10y+5 = 5(y^2-2y+1) = 5(y-1)^2
а) (-3y^2)^25y^4 = 9y^4 5y^4 = 45y^8
б) (2a-1)^2 + (2a+1)*(2a-1) = (2a-1)(2a-1) + (2a+1)(2a-1) = (2a-1)^2 + 2a(2a-1) - 1 = 4a^2 - 4a + 1 + 4a - 2 - 1 = 4a^2 - 1
а) 36b-by^2 = 36b - by^2 = b(36 - y^2) = b(6+y)(6-y)
б) 5y^2-10y+5 = 5(y^2-2y+1) = 5(y-1)^2