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Question

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

he number is


Options:
A .  4
B .  5
C .  6
D .  10
Answer: Option B

Let the number be `x`

Then  `3x^2` - `4x` =  `x` + 50   `hArr`   `3x^2` - `5x` - 50 = 0  `hArr`   `(3x + 10 ) (x - 5)` = 0  `hArr`   `x` = 5.



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