Question

[Đinh Cẩm Tú]

Phân tích các đa thức sau thành nhân tử:

a) x² + 5x + 4

b) 3x² + 4x - 7

c) x² + 7x + 12

Answer 1

[Lấp La Lấp Lánh]

a) \(x^2+5x+4==x\left(x+1\right)+4\left(x+1\right)=\left(x+1\right)\left(x+4\right)\)

b) \(3x^2+4x-7=3x\left(x-1\right)+7\left(x-1\right)=\left(x-1\right)\left(3x+7\right)\)

c) \(x^2+7x+12=x\left(x+3\right)+4\left(x+3\right)=\left(x+3\right)\left(x+4\right)\)

Answer 2

[Rin Huỳnh]

a) (x+1)(x+4)

b) (x-1)(3x+7)

c) (x+3)(x+4)