Answer:
B
Step-by-step explanation:
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y=1/2x-10
y=1/2x+b
-8=1/2(4)+b
-8=2+b
-10=b
If is a factor of the polynomial, it means that is a root of the polynomial.
In fact, if a polynomial has a root (i.e. ), then the polynomial is divisible by
In your case, you know that the polynomial is divisible by , so is a solution.
Let's evaluate and set it to zero:
We can check the answer: if the polynomial becomes
And we're claiming that is a root of this polynomial:
-60
hope it helps