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Phổ biến Word Problems >

If a number is subtracted from five times its square, the result is eighteen. Find all such numbers

Lời Giải

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

Lời Giải

The number : 2 or - 1 \frac{4}{5}

Các bước giải pháp

Represent the number with

x

A.T.Q.:

5 x^{2} - x = 18

Giải

x, 5 x^{2} - x = 18 : x = 2, x = - \frac{9}{5}

Chuyển phân số không thực sự thành hỗn số:

\frac{9}{5} = 1 \frac{4}{5}

The number : 2 or - 1 \frac{4}{5}

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