Question

Phân tích các đa thức sau thành nhân tử:

a) 9x²y+15xy²-3x

b) 3z(z-2)+5(2-z)

c) x²+4xy-4z²+4y²

d) x²+2x-15

Answer 1

Explanation:

a) 9x²y+15xy²-3x

3x(3xy+5y^2-1)

b) 3z(z-2)+5(2-z)

3z(z-2)-5(z-2)

(z-2)(3z-5)

c) x²+4xy-4z²+4y²

x²+4xy+4y² -4z²

(x+2y)^2 - (2z)^2

(x+2y-2z)(x+2y+2z)

d) x²+2x-15

x^2+5x-3x-15

x(x+5)-3(x+5)

(x+5)(x-3)