Question

Giá trị x thỏa mãn (2x-5)(3x+2)-6x^2+5x-1=13 là

Answer 1

\(\Leftrightarrow3x\left(2x-5\right)+2x-5-6x^2+5x-1-13=0\\ \Leftrightarrow6x^2-15x+2x-5-6x^2+5x-1-13=0\\ \Leftrightarrow-8x-19=0\\ \Leftrightarrow-8x=19\\ \Leftrightarrow x=-\dfrac{19}{8}\)

Answer 2

Answer 3

⇔3x(2x−5)+2x−5−6x2+5x−1−13=0⇔6x2−15x+2x−5−6x2+5x−1−13=0⇔−8x−19=0⇔−8x=19⇔x=−198