Question

Giúp vs ạ , cảm ơn nhìu

Answer 1

a) \(=5x\left(y+2x\right)\)

b) \(=x\left(x-6y\right)+3\left(x-6y\right)=\left(x-6y\right)\left(x+3\right)\)

c) \(=\left(x^2+6x+9\right)-y^2=\left(x+3\right)^2-y^2=\left(x-y+3\right)\left(x+y+3\right)\)

d) \(=\left(x^2-5x\right)-\left(4x-20\right)=x\left(x-5\right)-4\left(x-5\right)=\left(x-4\right)\left(x-5\right)\)

Answer 2

a) 5x( y+ 2)

b)(x²+3x)-(6xy+ 18y)

=x(x+3)-6y(x+3)

=(x+3)(x-6y)

c)(x²-y²)+ (6x+9)

=(x-y)(x+y)+3(2x+3)

d) chịu  nha

 

Answer 3

a) 5xy+10x=5x(y+2)
b) x²-6xy+3x-18y
=(x²+3x)+(-6xy-18y)
=x(x+3)-6y(x+3)
=(x-6y)(x+3)
c) x²-y²+6x+9
=(x²+6x+9)-y²
=(x+3)²-y²
=(x+3-y)(x+3+y)
d) x²-9x+20
=x²-4x-5x+20
=x(x-4)+5(x-4)
=(x+5)(x-4)