Question

entre os numeros - 2 , 0 , 1 , 4 quais deles sao a raizes da equaçao x²-2x-8=0

Answer 1

x^2-2x-8=0

Delta=b^2-4ac
Delta=(-2)^2-4.1.(-8)
Delta=4+32
Delta=36

x=-2-6/2=-4
x-2+6/2=2