Question

X elevado ao cubo menos 5x mais 6 igual a 0

Answer 1

x³-5x+6 = 0

Δ = 25 - 4.1.6

Δ = 25 - 24

Δ = 1

(5 +- 1)/2

x' = (5+1)/2

x' = 6/2 = 3

x'' = (5-1)/2

x'' = 4/2 = 2

Answer 2

${x}^{2} - 5x + 6 = 0 \\ \\ x = \frac{ - ( - 5) + - \sqrt{(25 - 24)} }{2 \times 1} \\ x = \frac{5 + - \sqrt{1}}{2} \\ x = \frac{5 + - 1}{2} \\ x1 = \frac{5 + 1}{2} = \frac{6}{2} = 3 \\ x2 = \frac{5 - 1}{ 2} = \frac{4}{2} = 2$

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