a.
=5z(x^2-2x-y^2)
c. =4x^2+6x-2x-3
=(4x^2-2x)+(6x-3)
2x(2x-1)+3(2x-1)
=(2x-1)(2x+3)
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a: \(5x^2z-10xyz-5y^2z\)
\(=5z\left(x^2-2xy-y^2\right)\)
b: \(4x^2+4x-3\)
\(=4x^2+6x-2x-3\)
\(=2x\left(2x+3\right)-\left(2x+3\right)\)
\(=\left(2x+3\right)\left(2x-1\right)\)
c: Sửa đề: \(x^2-xy-12y^2\)
\(=x^2-4xy+3xy-12y^2\)
\(=x\left(x-4y\right)+3y\left(x-4y\right)\)
\(=\left(x-4y\right)\left(x+3y\right)\)
d: \(3x+3y-x^2-2xy-y^2\)
\(=3\left(x+y\right)-\left(x+y\right)^2\)
\(=\left(x+y\right)\left(3-x-y\right)\)
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