Question

as raízes da equaçao :x^2-4x-5=0

Answer 1

x² - 4x - 5 = 0

delta = (-4)² - 4.1.(-5)
delta = 16 + 20
delta = 36

x = -(-4) ± √36/2.1

x = 4 ± 6/2

x = 4 + 6/2 = 10/2 = 5

x = 4 - 6/2 = -2/2 = -1


s={ 5, -1 }

Answer 2

x²-4x-5=0

/\=(-4)²-4.1.(-5)
/\=16+20
/\=36

x'= -(-4)+6/2
x'=4+6/2
x'=10/2
x'=5

x"= -(-4)-6/2
x"=4-6/2
x"= -2/2
x"= -1

S={5,-1}

LETRA B
bj