Question

Phân tich đa thức thành nhân tử

A) 4y^2 - x^2 + 2x - 1

B) x^2 + 9x + 20

Answer 1

a) ĐỀ ss ý

b) \(x^2+9x+20\\ =x^2+4x+5x+20\\ =x\left(x+4\right)+5\left(x+4\right)\\ =\left(x+4\right)\left(x+5\right)\)

Answer 2

a, = (2y)² - (x^2 - 2x +1)

= (2y)² - (x-1)²

=(2y - x +1).(2y + x - 1)

Answer 3

b, = x^2 +4x +5x+20

=x.(x+4)+5.(x+4)

=(x+5).(x+4)