Question

qual e o resultado da equação x2-8x+7=0?

Answer 1

X² - 8X + 7 => 0

↓ DELTA ↓

(8)² - 4 .1 .(7)

64 - 28

∆:. √36

∆:.(6)

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RAÍZES :.

-(-8)±6/2.1

X'=> 8+6/2=> 14/2=> (7)

X"=> 8-6/2=> 2/2=> (1)

soluções :. {7 e 1}

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boa noite!! :)

Answer 2

∆=b²-4ac
∆=(-8)² -4•1•7
∆=64-28
∆=36

x=-b+/- √∆/2.a
x=-(-8)+/- √36/2.1 = 8+/-6/2

x'=8-6/2= 2/2= 1

x"= 8+6/2 =14/2= 7

S={1 e 7}