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g(a) = a + 2
f(a+2) = 15
15 = (a+2)² - 3.(a+2) + 5
= a² + 4a + 4 - 3a - 6 + 5
= a² + a + 3
a² + a + 3 - 15 = 0
(a+4) (a-3) = 0
a = -1
a = 3