Answer:
f(5, 0) = 25
f(5, -3) = 61
Explanation:
f(x, y) = x² - 3xy - y²
⇒ f(5, 0) = (5)² - 3(5)(0) - (0)²
= 25 - 0 - 0
= 25
⇒ f(5, -3) = (5)² - 3(5)(-3) - (-3)²
= 25 - 15(-3) - 9
= 25 + 45 - 9
= 61
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