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Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ?Options4576

Question

Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is ?Options4576

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Solution

Vamos resolver a equação passo a passo.

Seja x x o número natural.

A equação dada é: 3x24x=x+50 3x^2 - 4x = x + 50

Primeiro, vamos reorganizar a equação para que todos os termos estejam de um lado: 3x24xx50=0 3x^2 - 4x - x - 50 = 0 3x25x50=0 3x^2 - 5x - 50 = 0

Agora, vamos resolver essa equação quadrática usando a fórmula de Bhaskara: x=b±b24ac2a x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

Aqui, a=3 a = 3 , b=5 b = -5 e c=50 c = -50 .

Primeiro, calculamos o discriminante (Δ \Delta ): Δ=b24ac \Delta = b^2 - 4ac Δ=(5)243(50) \Delta = (-5)^2 - 4 \cdot 3 \cdot (-50) Δ=25+600 \Delta = 25 + 600 Δ=625 \Delta = 625

Agora, aplicamos o valor do discriminante na fórmula de Bhaskara: x=(5)±62523 x = \frac{-(-5) \pm \sqrt{625}}{2 \cdot 3} x=5±256 x = \frac{5 \pm 25}{6}

Isso nos dá duas soluções: x=5+256=306=5 x = \frac{5 + 25}{6} = \frac{30}{6} = 5 x=5256=206=103 x = \frac{5 - 25}{6} = \frac{-20}{6} = -\frac{10}{3}

Como estamos procurando um número natural, descartamos a solução negativa. Portanto, a solução é: x=5 x = 5

A resposta correta é 5.

This problem has been solved

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