Respostas

  • Ind
  • Ambicioso
2013-12-08T14:11:07-02:00
I) 2x² -7x - 15 = 0, a = 2, b = -7 e c = - 15

Δ = b² - 4.a.c
Δ=  (-7)² - 4.2.-15
Δ = 49 + 120
Δ = 169 

II) X' = - b +√Δ / 2.a
Obs> √169 = 13

x' =  \frac{-(-7)+13}{2.2}

x'= \frac{20}{4} = 5

X'' = -b -√Δ/2a

X'' =  \frac{7-13}{2.2} = \frac{-6}{4}= \frac{-3}{2}
9 5 9