Question

qual a resolucao por favor$x^{2} -4x-5=0$

Answer 1

x² - 4x - 5=0
Δ= b² - 4ac
Δ= (-4) ² - 4 .1. (-5)
Δ= 16 + 20
Δ= 36

x= -b +/- √Δ / 2a
x= -(-4) +/- √36 / 2.1
x= 4 + 6 /2
x'= 10 /2
x'= 5

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

Answer 2

x² - 4x - 5=0
Δ= b² - 4ac
Δ= (-4) ² - 4 .1. (-5)
Δ= 16 + 20
Δ= 36

x= -b +/- √Δ / 2a
x= -(-4) +/- √36 / 2.1
x= 4 + 6 /2
x'= 10 /2
x'= 5

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