(2x²-10x) (x²+3x) tolong pakai cara yaa

(2x² - 10x) (x² +3x)
2x^4 + 6x^3 - 10x^3 - 30x^2
2x^4 - 4x^3 - 30x^2
2x^2(x^2 - 2x -15)
2x^2(x + 3) (x - 5)
2x²(x + 3) (x - 5)