Answer:
24
Step-by-step explanation:
2x + (x + y)2 = 6 + (3+6)2 = 6 + 18 = 24
I don't understand why did you write about z, it's not needed.
:)
87 is the (x+y)2 is supposed to be (x+y)^2
2x+(x+y)2
2(3)+(3+6)2
6+(9)2
6+81
87
