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f(a) = a² - 4x
f(a+3) = (a+3)² - 4(a+3)
f(a+3) = (a+3)(a+3) - 4a - 12
f(a+3) = a² + 6a + 9 - 4a - 12
f(a+3) = a² + 6a - 4a + 9 - 12
f(a+3) = a² + 2a - 3
semogamembantu