Answer:
=x
Step-by-step explanation:
Answer:
Step-by-step explanation:
When two numbers have a particular sum, subtracting either from the sum will give the other.
Answer:
18
Step-by-step explanation:
![{82 { }^{2} } - 80 {}^{2} = 324 \\ \sqrt{324 } = 18](https://tex.z-dn.net/?f=%7B82%20%7B%20%7D%5E%7B2%7D%20%7D%20-%20%2080%20%7B%7D%5E%7B2%7D%20%20%3D%20324%20%5C%5C%20%20%5Csqrt%7B324%20%7D%20%20%3D%2018)
Just subst. -7 for x in f(x) = 2x + 8. We get 2(-7) + 8, or -6.