Question

find the roots of quadratic equation x2-4=0 ( it is not 2x it is the square)​

Answer 1

Answer:

For this, you need a concept of imaginary numbers

x

2

+

4

=

0

⇒

x

2

+

4

−

4

=

0

−

4

(Subtracting

4

from both sides)

⇒

x

2

=

−

4

⇒

x

=

√

−

4

⇒

x

=

√

−

1

×

4

⇒

x

=

±

2

√

−

1

(The value of

√

−

1

is

i

)

⇒

x

=

±

2

i