Question

X²-2x-15=0 na forma de equaçao do 2 grau

Answer 1

x²-2x-15=0

b²-4a.cd
4-4.1.(-15)
4-4.(-15)
4+60
64
Raiz quadrada de 64 = 8 

-b+-Raiz de delta/2a

2+-8/2

x¹ = 5
x² = 3