Question

Answer 1

c: \(\Leftrightarrow\left(2x+3\right)\left(4x^2-6x+9\right)+\left(x-9\right)\left(2x+3\right)=0\)

\(\Leftrightarrow\left(2x+3\right)\left(4x^2-5x\right)=0\)

hay \(x\in\left\{-\dfrac{3}{2};0;\dfrac{5}{4}\right\}\)

d: \(\Leftrightarrow\left(x^2+9\right)\left(2x-1\right)-6x\left(2x-1\right)=0\)

\(\Leftrightarrow\left(2x-1\right)\left(x^2-6x+9\right)=0\)

=>x=3 hoặc x=1/2