Question

Quais as raízes da equaçã ?
$2x{2} - 8x - 10 = 0$
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Answer 1

2x²-8x-10=0 (÷2)

x²-4x-5=0

∆=b²-4.a.c

a=1 , b= -4 e c= -5

∆= (-4)²-4.1.(-5)

∆= 16 +20

∆= 36

x= -b±√∆/2.a

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}