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Popular Word Problems >

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

Solução

I f a n u mb er i s s u b t r a c t e d f ro m tw o t im es i t s s q u a re, t h e res u lt i s tw e n t y - e i g h t . F in d a ll s u c h n u mb ers .

Solução

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

Passos da solução

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}

Converter as frações impróprias em números mistos:

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

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

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