Question

Find roots of x² - 18 - 0​

Answer 1

Add
18
18
to both sides of the equation.
x
2
=
18
x
2
=
18
Take the square root of both sides of the equation to eliminate the exponent on the left side.
x
=
±
√
18
x
=
±
18
The complete solution is the result of both the positive and negative portions of the solution.
Tap for more steps...
x
=
3
√
2
,
−
3
√
2
x
=
3
2
,
-
3
2
The result can be shown in multiple forms.
Exact Form:
x
=
3
√
2
,
−
3
√
2
x
=
3
2
,
-
3
2
Decimal Form:
x
=
4.24264068
…
,
−
4.24264068
…