Ответ:
a)a²+2a+9-a²+4=2a+9
a=-3.5
2×(-3.5)+9=7.0+9=16
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Ответ:
a)a²+2a+9-a²+4=2a+9
(a-2)(a+2)=a²-4
a=-3.5
2×(-3.5)+9=7.0+9=16