Phân tích đa thức thành nhân tử
a, 3ax-4by-4ay+3bx
b, 3x\(^2\)-6xy+3y\(^2\)-12t\(^2\)
c, 4x\(^2\)-6y+3x+8xy
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a) \(7\left(3x-2\right)+y\left(3x-2\right)=\left(3x-2\right)\left(7+y\right)\)
b) \(x\left(y-x\right)-3\left(x-y\right)=x\left(y-x\right)+3\left(y-x\right)=\left(y-x\right)\left(x+3\right)\)
c) \(x^2-6xy+9y^2=\left(x-3y\right)^2\)
\(x^2-2xy+x-2y=x\left(x-2y\right)+x-2y=\left(x-2y\right)\left(x+1\right)\)
\(3x^3+6x+3-3y^2=3\left[\left(x^2+2x+1\right)-y^2\right]=3\left[\left(x+1\right)^2-y^2\right]=3\left(x-y+1\right)\left(x+y+1\right)\)
\(1,3x^2-6xy+3y^2-12z^2\)
\(=3\left(x^2-2xy+y^2-4z^2\right)\)
\(=3[\left(x^2-2xy+y^2\right)-4z^2]\)
\(=3\left[\left(x-y\right)^2-4z^2\right]\)
\(=3\left(x-y-2x\right)\left(x-y+2z\right)\)
\(2,x^2-2x-15\)
\(=x^2-5x+3x-15\)
\(=\left(x^2-5x\right)+\left(3x-15\right)\)
\(=x\left(x-5\right)+3\left(x-5\right)\)
\(=\left(x+3\right)\left(x-5\right)\)
a) 4x2 - 1
= (2x - 1)(2x + 1)
b) ax + 3a - bx - 3b
= a(x + 3) - b(x + 3)
= (x + 3)(a - b)
c) 4x2 - 8xy + 4y2 - 16
= (2x - 2y)2 - 42
= (2x - 2y - 4)(2x - 2y + 4)
d) 2x2 - 3x - 9
= 2x2 + 3x - 6x - 9
= x(2x + 3) - 3(2x + 3)
= (2x + 3)(x - 3)
\(4x^2-9y^2+4x-6y=\left(4x^2-9y^2\right)+\left(4x-6y\right)=\left(2x-3y\right)\left(2x+3y\right)+2\left(2x-3y\right)=\left(2x-3y\right)\left(2x+3y+2\right)\)
\(4x^2-9y^2+4x-6y\)
\(=\left(2x-3y\right)\left(2x+3y\right)+2\left(2x-3y\right)\)
\(=\left(2x-3y\right)\left(2x+3y+2\right)\)
a) \(7x^2+34x-5=7x\left(x+5\right)-1\left(x+5\right)\)
\(=\left(x+5\right)\left(7x-1\right)\)
b) \(12a^2-3ab+8ac-2bc=3a\left(4a-b\right)+2c\left(4a-b\right)\)
\(=\left(4a-b\right)\left(3a+2c\right)\)
\(a,=7x^2-x+35x-5=x\left(7x-1\right)+5\left(7x-1\right)=\left(x+5\right)\left(7x-1\right)\\ b,=3a\left(4a-b\right)+2c\left(4a-b\right)=\left(3a+2c\right)\left(4a-b\right)\)
\(a,Sửa:x^2-xy-13x+13y=x\left(x-y\right)-13\left(x-y\right)=\left(x-13\right)\left(x-y\right)\\ b,=\left(x+y\right)^2-\left(2z\right)^2=\left(x+y-2z\right)\left(x+y+2z\right)\\ c,=\left(x^2-2x\right)-\left(3x-6\right)=x\left(x-2\right)-3\left(x-2\right)=\left(x-2\right)\left(x-3\right)\)
a) \(=\left(3ax+3bx\right)-\left(4by+4ay\right)=3x\left(a+b\right)-4y\left(a+b\right)=\left(a+b\right)\left(3x-4y\right)\)
b) \(=3\left[\left(x^2-2xy+y^2\right)-4t^2\right]=3\left[\left(x-y\right)^2-4t^2\right]=3\left(x-y-2t\right)\left(x-y+2t\right)\)
c) Không phân tích được