a^2 + 6a +9 - a^2 +4 = 6a +13 = 6 * (-3.5) + 13 = -21 + 13 = -8
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a^2 + 6a +9 - a^2 +4 = 6a +13 = 6 * (-3.5) + 13 = -21 + 13 = -8