Question

Помогите плз
$frac{3 x^{2}-2 }{2} -8x=21$

Answer 1

$frac{3 x^{2}-2 }{2} -8x=21$
${3 x^{2}-2 } -16x=42$
${3 x^{2}-2 } -16x-42=0$
${3 x^{2} -16x-44=0$
$D=(-16)^2-4*3*(-44)=256+528=784=28^2$
$x_1= frac{16+28}{6}= frac{44}{6} = frac{22}{3} =7 frac{1}{3}$
$x_2= frac{16-28}{6} =-2$