$$ 3 z-4 z-5 \quad $$ use $$ \quad z=9 $$

Question

UpStudy AI · Accepted Answer

We start with the expression:

$$
3z - 4z - 5
$$

**Step 1: Combine like terms**

The terms $$3z$$ and $$-4z$$ are like terms. Combining them gives:

$$
3z - 4z = -z
$$

So the expression becomes:

$$
-z - 5
$$

**Step 2: Substitute $$ z = 9 $$**

Replace $$ z $$ with $$9$$:

$$
-z - 5 = -9 - 5
$$

**Step 3: Simplify the expression**

Perform the subtraction:

$$
-9 - 5 = -14
$$

Thus, the value of the expression when $$ z = 9 $$ is:

$$
-14
$$
When $$ z = 9 $$, the expression $$ 3z - 4z - 5 $$ simplifies to $$-14$$.

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