Question

a)x^2yz-x^3y^3z+xyz^2

b)3x^2-6xy+15xy^2z

c)2x(x-4)-5(4-x)-(2x+5)(7-5x)

d)16x^2-24xy+9x^2

e)49-x^2-2xy-y^2

Answer 1

e: \(49-x^2-2xy-y^2\)

\(=49-\left(x+y\right)^2\)

\(=\left(7-x-y\right)\left(7+x+y\right)\)

d: \(16x^2-24xy+9y^2=\left(4x-3y\right)^2\)

Answer 2

a)=xyz(x-x^2y^2+z)

e)=7²+(x-y)² 

^{[7+(y-x)].[(7-(y-x)] còn lại tự làm ;)}

Answer 3

b)=3x(x-2y+5y²z)