Question

1) x(x-3)-2x(x-3)=0

2) x(3x-1)-5(1-3x)=0

3) 5(x+3)-2x(3x+3)=0

4) 4x(x+3)-x-3=0

5) x³+15x²+75x+125=0

6) 4x²-12x+9=0

7) x²-16x+60=0

8) x³+48x=12x²+64

Answer 1

1,=\(x^2-3x-2x^2+6x=-x^2+3x\)

2,=\(3x^2-x-5+15x=3x^2+14x-5\)

3,=\(5x+15-6x^2-6x=-6x^2-x+15\)

4,=\(4x^2+12x-x-3=4x^2+11x-3\)

Answer 2

5: =>(x+5)^3=0

=>x+5=0

=>x=-5

6: =>(2x-3)^2=0

=>2x-3=0

=>x=3/2

7: =>(x-6)(x-10)=0

=>x=10 hoặc x=6

8: \(\Leftrightarrow x^3-12x^2+48x-64=0\)

=>(x-4)^3=0

=>x-4=0

=>x=4