a² - 4a + 3

= a² - a - 3a + 3

= a.(a - 1) - 3.(a - 1)

= (a - 1).(a - 3)

=   \(a^2-3a-a+3\)= \(a\left(a-3\right)-\left(a-3\right)\)=   \(\left(a-3\right)\left(a-1\right)\)

a)   \(\left(x-7\right)\left(x+2\right)\)

b)  \(\left(2x-3\right)\left(x+2\right)\)

a) 3x² + 10x + 8

= 3x² + 6x + 4x + 8

= 3x.(x + 2) + 4.(x + 2)

= (x + 2).(3x + 4)

b) 2x² + x - 6

= 2x² + 4x - 3x - 6

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

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

a)    \(\left(3x+4\right)\left(x+2\right)\)

b)    \(\left(2x-3\right)\left(x+2\right)\)

a) 3x² + 10x + 8

= 5x² - 2x² + 10x + 8

= (5x² + 10x) + (-2x² + 8)

= 5x(x + 2) - 2(x² - 4)

= 5x(x + 2) - 2(x + 2) (x - 2)

rùi bn làm tiếp nha mk bí!! 6575685685976978454254534565654567567567567563454

a/ \(x^2-4x+3=\left(x^2-x\right)-\left(3x-3\right)=x\left(x-1\right)-3\left(x-1\right)=\left(x-1\right)\left(x-3\right)\)

b/ \(3x^2-5x+2=\left(3x^2-3x\right)-\left(2x-2\right)=3x\left(x-1\right)-2\left(x-1\right)=\left(x-1\right)\left(3x-2\right)\)

\(x^2-4x+3\)

\(=x^2-3x-x-3\)

\(=x\left(x-1\right)-3\left(x-1\right)\)

\(=\left(x-3\right)\left(x-1\right)\)

\(3x^2-5x+2\)

\(=3x^2-3x-2x+2\)

\(=3x\left(x-1\right)-2\left(x-1\right)\)

\(=\left(3x-2\right)\left(x-1\right)\)

a/ x²-4x+3=x²-x-3x+3=x(x-1)-3(x-1)=(x-3)(x-1)

b/ 3x²-5x+2=3x²-3x-2x+2=3x(x-1)-2(x-1)=(3x-2)(x-1)

a) x(x - 2) + x - 2

= x(x - 2) + (x - 2)

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

b) 5x(x - 3) - x + 3

= 5x(x - 3) - (x - 3)

= (x - 3).(5x - 1)

a.x(x-2)+x-2

=(x-2)(x+1)

b.5x(x-3)-x+3

=5x(x-3)-(x-3)

=(x-3)(5x-1)

a)\(x\left(x-2\right)+x-2\)

\(=x\left(x-2\right)+\left(x-2\right)\)

\(=\left(x-2\right)\left(x+1\right)\)

b)\(5x\left(x-3\right)-x+3\)

\(=5x\left(x-3\right)-\left(x-3\right)\)

\(=\left(x-3\right).\left(5x-1\right)\)

Nếu thấy đúng thì k mk nha

a. x² + 7xy + 10y²

= x² + 2xy + 5xy + 10y²

= x.(x + 2y) + 5y.(x + 2y)

= (x + 2y).(x + 5y)

b. x² - 6xy + 5y²

= x² - xy - 5xy + 5y²

= x.(x - y) - 5y.(x - y)

= (x - y).(x - 5y)