Question

Calculando as raízes dá equação do 2° grau...?
help mee

Answer 1

S= -b/a P= c/a

S= -2/1 P= -15/1

S= -2 P= -15


S= {-2,-15} ( letra D )

Answer 2

Δ= -2²-4.1.-15
Δ= 4+60
Δ= 64

x= -b +- $\sqrt{Δ}$ ÷ 2.a

x= 2+-$\sqrt{64}$ ÷ 2.1

x= 2+- 8 ÷ 2

x= $\frac{2+8}{2}$ = $\frac{10}{2}$ = 5

x= $\frac{2-8}{2}$ = $\frac{-6}{2}$ = 3