Add both sides by 16
so you'll have x^4 =16
take the 4th root of both sides and you'll get x= 2
The given expression is
-2x² + 17 - 15x + 7xy
The algebraic expression may be written as
-2x² + 7xy - 15x + 17
The constant term does not contain either x or y.
Therefore 17 is the constant term.
Answer: 17
I think it'd be better if you gave us some sort of diagram with it?
Answer:
Standard form: 
Leading coefficient: 1
Step-by-step explanation:

The leading coefficient is 1 because the leading term is
.