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f(a) = a² + 3a - 14
14 = a² + 3a - 14
a² +3a - 28 = 0
(a+7) (a-4)
a=-7 a=4
jadi, nilai a=-7 atau a=4
f(a) = a² + 3a -14 = 14
a²+3a-14 = 14
a² +3a = 14+14
a² +3a = 28
umm... saya tidak tau langkah selanjutnya, tetapi jawabannya a=4
maaf.