How many terms are in the expression shown below?
a2 - ab + 8b + b2 - 1
2
3
4
5

A² - ab + 8b + b² - 1

There are 5 terms in the expression. 
a² = 1st term
ab = 2nd term
8b = 3rd term
b² = 4th term
1 = 5th term

Each term is separated by a plus (+) sign or a minus (-) sign.

A term is either a number, a variable, or a number and a variable multiplied together.

a², ab, b² are variables.
8b is a number and a variable multiplied together
1 is a number.

Sorry can't answer that question