Level
1

**
STEP 1
**
: 1 = 1

**
STEP 2
**
: 1 =
$\sqrt { 1 }$

**
STEP 3
**
: 1 =
$\sqrt { -1\times -1 }$

**
STEP 4
**
: 1 =
$\sqrt { -1 } \times \sqrt { -1 }$
or
$i\quad \times \quad i$

**
STEP 5
**
: 1=
${ \left( \sqrt { -1 } \right) }^{ 2 }$
or
${ i }^{ 2 }$

**
STEP 6
**
: 1 = -1

*
Question
*
:
**
THE ERROR IS IN WHICH STEP?
**

STEP 3
STEP 2
STEP 4
STEP 5

**
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$\sqrt { ab } = \sqrt { a } \times\sqrt { b }$ is valid for only positive values of a and b