x
2
=
20
square root both sides
x
=
±
√
20
x
=
2
√
5
or
x
=
−
2
x
=
±
√
20
Explanation:
Initial equation
x
2
−
20
=
0
Add
20
on both sides
x
2
=
20
Add a square root to both sides
√
x
2
=
±
√
20
Simplify
x
=
±
√
20
Hope that makes sense!
Step-by-step explanation:
