Answer:
-
- 2z
- 5
Explanation:
This is the equation that you started off with:
(x - z -
)(x + z +
)
You can't really use FOIL on this because that's used in multiplying binomials, and this is a trinomial, but you can still break it up and simplify it this way:
(a + b + c)*(d + e + f) = (a(d + e +f)) + (b(d + e + f)) + (c(d + e + f))
So, applying that idea to the actual equation:
x(x + z +
) -z(x + z +
) -
(x + z +
)
= x^2 + xz + x
-xz -z^2 - z
- x
- z
- 5
= x^2 - z^2 - 2z
- 5
or