Find x, if 2 _2 x=4 - Vidyadip

MCQ

Find $x$, if $2 \log _2 x=4$

A
$4,-4$
✓
$4$
C
$-4$
D
not defined

✓

Answer

Correct option: B.

$4$

(B) $4$
Hint:
$2 \log _2 x=4, x>0$
$\therefore \log _2\left(x^2\right)=4$
$\therefore x^2=16$
$\therefore x= \pm 4$
$\therefore x=4$

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