Question

Resolva a equação do 2x^2+9× +8=0

Answer 1

$\boxed{\begin{array}{l}\sf2x^2+9x+8=0\\\sf a=2\quad b=9\quad c=8\\\sf\Delta=b^2-4\cdot a\cdot c\\\sf\Delta=9^2-4\cdot2\cdot8\\\sf\Delta= 81- 64\\\sf\Delta= 17\\\\\sf x=\dfrac{-b\pm\sqrt\Delta}{2\cdot a}\\\\\sf x=\dfrac{-9\pm\sqrt{17}}{4}\\\\\sf S=\left\{\dfrac{-9-\sqrt{17}}{4}\,;\,\dfrac{-9+\sqrt{17}}{4}\right\}\end{array}}$