Question

2 grau : 2x²-7x-15=0

Answer 1

Na formula de delta fica :

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

e na de Baskara fica : 
x1 : $\frac{-(-7+)+13}{2.2}$     Obs = raiz de 169 = 13
x1 : -20/4 = 5

x2 : $\frac{7-13}{2.2} = \frac{-6}{4} = \frac{-3}{2}$

Answer 2

b²-4*a*c
-7²-4*2*(-15)
49+120
169

7+-13/4 =

x1 =5

x2 = -1.5