Question

x²+5x=0
3x²-7x+2=0




me ajudem por favor dou 80 pontos

Answer 1

Resolução!

${x}^{2} + 5x = 0$

Delta = 5^2 - 4 * 1 * 0

Delta = 25 - 0

Delta = 25

Delta = \/25

Delta = +-5

X ' = - 5 + 5/2

X ' = 0/2

X = 0

X " = - 5 - 5/2

X " = - 10/2

X " = - 5

S = { 0 , - 5 }

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$3 {x}^{2} - 7x + 2 = 0$

Delta = (-7)^2 - 4 * 3 * 2

Delta = 49 - 24

Delta = 25

Delta = \/25

Delta = +-5

X ' = 7 + 5/6

X ' = 12/6

X ' = 2

X " = 7 - 5/6

X " = 2/6

X " = 1/3

S = { 2 , 1/3 }

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