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已知函數(shù)f(x)＝x²＋(lga＋2)x＋lgb滿足f(－1)＝－2且對(duì)于任意x∈R，恒有f(x)≥2x成立．

(1)求實(shí)數(shù)a，b的值；

(2)解不等式f(x)＜x＋5．

已知函數(shù)f(x)＝x²＋(lga＋2)x＋lgb滿足f(－1)＝－2且對(duì)于任意x∈R，恒有f(x)≥2x成立．

(1)求實(shí)數(shù)a，b的值；

(2)解不等式f(x)＜x＋5．

已知函數(shù)f(x)＝x²＋(lga＋2)x＋lgb滿足f(－1)＝－2，且對(duì)一切實(shí)數(shù)x，都有f(x)≥2x，求實(shí)數(shù)a，b的值．

已知函數(shù)f(x)＝x²＋(lga＋2)x＋lgb滿足f(－1)＝－2且對(duì)于任意，恒有f(x)≥2x成立．

(1)求實(shí)數(shù)a，b的值；

(2)解不等式f(x)＜x＋5．