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Assume that (x-4) is a factor of 2x^2-4x-z. What is the value of z?
How would you set it up to use the foil method?
How would you set it up to use the foil method?
MarkFL said:Let:
$$f(x)=2x^2-4x-z$$
Now, if $x-4$ is a factor of $f$, then we must have:
$$f(4)=0$$
So, this allows us to write:
$$2(4)^2-4(4)-z=0$$
Can you proceed?