The number which exceeds its square by the greatest possible quan… - Vidyadip

MCQ

The number which exceeds its square by the greatest possible quantity is,

✓
$\frac{1}{2}$
B
$\frac{1}{4}$
C
$\frac{3}{4}$
D
None of these.

✓

Answer

Correct option: A.

$\frac{1}{2}$

Let the required number be $x.$Then, $f^{\prime}(x)=x-x^2$
lmplies that $f(x) = 1 - 2x = 0$
For a local maxima or a local minima, we must have $f\ '(x) = 0$
lmplies that $2x = 1$
lmplies that $\text{x}=\frac{1}{2}$
Now, $f\ ''(x) = -2 < 0$
Therefore, $\text{x}=\frac{1}{2}$ is a local maxima.
Hence, the required number is $\frac{1}{2}$.

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