1 Answer

Jason Stallings · Answer 1 · 2024-01-02T12:38:18+0000

Step-by-step explanation

Step 1

check every interval

$(-\infty,-7\rbrack$

means all values smaller or equal than -7

in math terms

$x\leq-7$

Step 2

$\lbrack9,\infty)$

it means all numbers greater or equal than 9,in math terms

$x\ge9$

Step 3

finally

$\cup\text{ = or}$

then, the solution is

$x\leq-7\text{ or x}\ge9$

I hope

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