(3x-8)(84-x) = 252x - 672 - 3x^2 + 8x = -3x^2 + 260x - 672
acum trebuie sa calculezi delta
Δ = 67600 - 8064 ⇒ Δ = 59536
x1 = [tex] \frac{-260+ \sqrt{ \ 59536 } }{6} [/tex] = [tex] \frac{-16}{-6} = \frac{8}{2} [/tex]
x2 = [tex] \frac{-260- \sqrt{59536} }{-6} = \frac{-504}{-6} = 84[/tex]
varianta 1
x=x1
12 × 80 = 960
varianta 2
x=x2
244 × 0 = 0
