а) 5a^2-45b^4 = 5(a^2-9b^4) = 5(a-3b^2)(a+3b^2)
б) -4m^2+24mn-36n^2 = -4(m^2-6mn+9n^2) = -4(m-3n)^2
в) x^3-125y^12 = (x-5y^4)(x^2+5xy^4+25y^8)
а) 5a^2-45b^4 = 5(a^2-9b^4) = 5(a-3b^2)(a+3b^2)
б) -4m^2+24mn-36n^2 = -4(m^2-6mn+9n^2) = -4(m-3n)^2
в) x^3-125y^12 = (x-5y^4)(x^2+5xy^4+25y^8)
x^3+5x^2-25x-125=0x^2(x+5)-25(x+5)=0
(x^2-25)(x+5)=0
(x-5)(x+5)(x+5)=0
x=5, -5.