This expression has four terms.
5, 9x, 7, and 2x
A term is a constant number, a variable, or a variable with a coefficient.
Since

Is a perfect square, we can think of the "-6" at the end as a "+4-10" and we have

Which is the required form
B= 2000 + CD
98000 = B + CD
substitute b in
98000 = 2000 + CD + CD
add variables
98000 = 2000 + 2CD
subtract 2000 from each side
96000 = 2CD
divide each side by 2
48000 = CD
32 is the answer to the problem