Question

Answer 1

1: \(=3\left(x-5\right)=3x-15\)

2: \(-x\left(-x+2\right)=x^2-2x\)

Answer 2

\(1,=\left|3\left(x-5\right)\right|=3\left(5-x\right)\\ 2,=\left|x\left(x-2\right)\right|=x\left(x-2\right)\left(x< 0;x-2< 0\right)\\ 3,=\sqrt{\dfrac{108x^3}{12x}}=\sqrt{9x^2}=\left|3x\right|=3x\\ 4,=\sqrt{\dfrac{13x^4y^6}{208x^6y^6}}=\sqrt{\dfrac{1}{16x^2}}=\dfrac{1}{\left|4x\right|}=-\dfrac{1}{4x}\)