Question

Qual o resultado de -X²-X +30 =0
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Answer 1

Resposta:

$x_{1} = - 6 \\ x_{5} = 5$

Explicação passo-a-passo:

$- {x}^{2} - x + 30 = 0 \\ \\ a = - 1 \\ b = - 1 \\ c = 30 \\ \\ x = \frac{ - b + - \sqrt{ {b}^{2} - 4ac } }{2a} \\ x = \frac{ - ( - 1) + - \sqrt{ { ( - 1)}^{2} - 4 \times ( - 1) \times 30 } }{2 \times ( - 1)} \\ x = \frac{1 + - \sqrt{1 +120} }{ - 2} \\ x = \frac{1 + - \sqrt{121} }{ - 2} \\ x = - \frac{1 + - 11}{2} \\ \\ x_{1} = - \frac{1 + 11}{2 } = - \frac{12}{2} = - 6 \\ x_{2} = - \frac{1 - 11 }{2} = - \frac{ - 10}{2} = \frac{10}{2} = 5$

Answer 2

Resposta:

$A =-1 B= -1 C=30 \\\\-1^2 -(4*-1*30)\\= \\\sqrt{121} \\\\\\B^2 -(4*A*C)\\= \sqrt{N} \\\\(-B+- \sqrt{N}) /2*A \\\\(1+11)/-2\\= -6\\\\(1-11)/-2 = 5$