How do solve $x^2<=9$ and write the answer as a inequality and interval notation?

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Answer 1 · 2016-12-26T01:22:37

$x<=+-3 <=> x<=|3|$

$-3<=x<=3$

$x^2<=9$

Take the square root on both sides:

$sqrt(x^2)<=sqrt9$

$x<=+-3$ which can also be written as $x<=|3|$

which is the same as

$-3<=x<=3$

How do solve x^2<=9x^2<=9 and write the answer as a inequality and interval notation?