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Popular >

If a number is subtracted from two times its square, the result is twenty-eight. Find all such numbers.

Solución

If a number is subtracted from two times its square, the result is twenty-eight. Find all such numbers.

Solución

The number : 4 or - 3 \frac{1}{2}

Pasos de solución

Represent the number with

x

A.T.Q.:

2 x^{2} - x = 28

Resolver para

x, 2 x^{2} - x = 28 : x = 4, x = - \frac{7}{2}

Convertir las fracciones impropias a números mixtos:

\frac{7}{2} = 3 \frac{1}{2}

The number : 4 or - 3 \frac{1}{2}

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