Final answer:
To evaluate the expression a²-b for a = -5/9 and b = -1/9, substitute the values of a and b into the expression and simplify.
Step-by-step explanation:
To evaluate the expression a²-b for a = -5/9 and b = -1/9, we substitute the values of a and b into the expression:
(-5/9)² - (-1/9)
Simplifying, we get:
(25/81) - (-1/9)
To subtract a negative number, we add, so:
(25/81) + (1/9)
Combining the fractions, we have:
(25 + 9)/(81)
Simplifying further, we get:
34/81