b. Jin writes an expression to describe the number of wolves in Year 4 of the
study. The expression is (x+a)(x-b), where a and b are whole numbers
greater than 1 and less than 10. Write an expression that could be the
expression Jin uses to describe the number of wolves in the park during
Year 4 of the study. Then multiply the two terms of the expression.
One possible expression that Jin could use to describe the number of wolves in Year 4 is (x+3)(x-5).
Multiplying the two terms together, we get:
(x+3)(x-5)
= x^2 - 5x + 3x - 15
= x^2 - 2x - 15
Therefore, the expression Jin uses to describe the number of wolves in Year 4 is x^2 - 2x - 15.