Question

Phân tích đa thức thành nhân tử:

a) 2x² - 7xy + 6y² + 9x - 13y - 5

b) 2x⁴ - 7x³ + 17x² - 20x + 14

c)2x⁴ - 19x³ + 2002x² - 9779x + 11670

help me !!!

Answer 1

2x⁴ -19x³+ 2002x² -9779x+11670

= 2x^4 -6x^3-13x^3+39x^2+1963x^2-5889x-3890x+11670

= 2x^3(x-3)-13x^2(x-3)+1963x(x-3)-3890(x-3)

=(x-3)(2x^3-13x^2+1963x-3890)

=(x-3)(2x^3-4x^2-9x^2+18x+1945x-3890)

=(x-3)(2x^2(x-2)-9x(x-2)+1945(x-2))

=(x-3)(x-2)(2x^2-9x+1945)