Three times the square of a natural number when decreased by 4 times the number is equal to 50 more than the number. The number is:

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Solution

The correct option is B
5

Let the number be x.

Then, $\Leftrightarrow$ Then, $3 x^{2} - 4 x = x + 50 \Leftrightarrow 3 x^{2} - 5 x - 50 = 0 \Leftrightarrow (3 x + 10) (x - 5) = 0 \Leftrightarrow x = 5.$

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