Question

2x²+x-15=0 Bhaskara

Answer 1

R= [(5/2,-3)]

cálculo em anexo.

Answer 2

2x²+x-15 = 0

a = 2.
b = 1.
c = -15.

b²-4ac
∆ = 1²-4.2.(-15)
∆ = 1-(-120)
∆ = 121
x = -b±√∆/2a
x = -1±√121/2.2
x = -1±11/4
x' = -1-11/4
x' = -12/4
x' = -3
x" = -1+11/4
x" = 10/4
x" = 5/2

S = { -3, 5/2 }. Espero ter ajudado!❤