The given expression has 3 terms.
The terms are the entities that are connected by addition or subtraction in a polynomial expression.
The constant term is the one which does not have any variable attached to it. In this case the constant is -7. Do not forget to consider the sign of constant term in such case.
So the answer to this question is
1st blank: 3
2nd blank: -7
For this case we must solve the following quadratic equation:

Where:

The solution is given by:

Substituting:

Thus, we have two roots:

ANswer:

S=(n/2)(A+t)
x2 x2
2S=n(A+t)
--- --------
n n
2S n(A+t)
---=---------
n n
2S
---=A+t
n
.....2S
A=----- -t
......n
For this case we must solve the following equation:

By definition, for the bases to be equal then the exponents must also be the same. Thus, we have to:

Dividing by 3 to both sides of the equation we have:

Answer:

I hope this is the answer you want