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Answer:
(a) 223
(b) 5 and √21
(c) 19
Explanation:
(a) 15² - 2 = 225 - 2 = 223
(b) 23 + 2 = 25
(a + 1/a) = √25 = 5
23 - 2 = 21
(a - 1/a) = √21
(c) (x + y)² = x² + y² + 2xy
(5)² = x² + y² + 2×3
(x² + y²) = 25 - 6 = 19
I hope it is clear, please Brainliest the answer.