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D05 Math
Question 20
2021 April(D05) Math Question 20
Number Types & Properties
- Complex Number
Complex Number, Undefined fraction
Choice K
a
2
+
1
=
0
a^2+1=0
a
2
+
1
=
0
a
2
=
−
1
a^2=-1
a
2
=
−
1
∴
a
=
±
{
−
1
}
=
i
\therefore a=\pm\sqrt\{-1\}=i
∴
a
=
±
{
−
1
}
=
i
Skills you are tested for:
Complex Number
Undefined fraction
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