Question

 làm giúp mình vs ạ

Answer 1

a: \(\Leftrightarrow2\left(x^2-2x+1\right)+5^2=3\left(x^2-x-2\right)\)

\(\Leftrightarrow2x^2-4x+2+25-3x^2+3x+6=0\)

\(\Leftrightarrow-x^2-x+33=0\)

hay \(x\in\left\{\dfrac{-1+\sqrt{133}}{2};\dfrac{-1-\sqrt{133}}{2}\right\}\)

b: \(\Leftrightarrow x+2-2x+6=x^2+2x+1\)

\(\Leftrightarrow x^2+2x+1=-x+8\)

\(\Leftrightarrow x^2+3x-7=0\)

hay \(x\in\left\{\dfrac{-3+\sqrt{37}}{2};\dfrac{-3-\sqrt{37}}{2}\right\}\)