Answer:
-7/5 if your function really is f(x)=-5x-7
Explanation:
The zeros of an expression are the numbers you can plug into that expression that will make that expression 0.
So what value of x will make the expression
-5x-7=0.
You don't have to this by observation. We can just solve it and see.
-5x-7=0
Add 7 on both sides:
-5x. =7
Divide both sides by -5:
x. =7/-5
x. =-7/5
So -7/5 will make the expression equal to 0.
Let's test this:
-5x-7 when x=-7/5
-5(-7/5)-7
7-7
0
So it does indeed.