Question

D = 5² -4.a.c
X= -5 + √∆
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2a

X²-4x-5=0

Answer 1

Explicação passo-a-passo:

x² -4x -5=0

∆= (-4)² - 4.1 .(-5)

∆= 16 + 20

∆= 36

x= - (-4) ±√36/2.1

x= 4 ±6/2

x1= 4+6/2= 10/2=5

x2= 4-6/2= -2/2= -1

S= { -1, 5}