Question

Equação de 2'grau : X2 - 2× -8 =0

Answer 1

X²-2X-8=> 0


↓DELTA↓

(2)²-4.1.(-8)

4+32

∆:.√36

∆:.6

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↓ RAÍZES ↓

-(-2)+6/2


X'=> 2+6/2=> 8/2=> (4)

X"=> 2-6/2=> -4/2=> (-2)


S:. {4 e -2}


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boa noite :)

Answer 2

x² - 2x - 8 = 0

A= 1

B=- 2

C= - 8

∆= b² - 4ac

∆= ( - 2)² - 4 • 1 • (- 8)

∆= 4 + 32

∆= 36

x= - b ± √∆ /2a

x= - ( - 2) ± √36 / 2 • 1

x'= 2 + 6/2 = 8/2 = 4

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

S= ( 4 , - 2)