Could x = -5 be a solution to the inequality -6 < 3x + 9 < 21?

So you think that x = -5 is the solution for the inequality? Let's check it out.

(Check)

- Substitute x = -5 in the inequality

If it was the symbol ≤ you'd be correct, but it's < so It's a bit wrong.

Now let's solve the inequality. Separate the inequality by parts.

Therefore, the inequality is true only when x > -5 or x < 4.

(Check)

- Substitute x = -4 in the inequality.

The inequality is true for first case.

- Substitute x = 3 in the inequality

The inequality is true for second case.

So the answer for inequality is -5 < x < 4

That means only {-4, -3, -2, ..., 3} can make the inequality true.

it happens during combustion and impacts the environment because the plants and trees take in that and it can cause them to die.