Proof WritingMediumWriting It Up ShareWriting It Up · Medium problemA final version reads: "(a+b)2≥4ab(a + b)^2 \ge 4ab(a+b)2≥4ab for all real a,ba, ba,b, since ___." Which reason makes the line checkable?Aaaa and bbb are positiveBa2+b2≥0a^2 + b^2 \ge 0a2+b2≥0C(a+b)2≥0(a + b)^2 \ge 0(a+b)2≥0D(a+b)2−4ab=(a−b)2≥0(a + b)^2 - 4ab = (a - b)^2 \ge 0(a+b)2−4ab=(a−b)2≥0Check Show answer Walk through it step by step Practice more like this Review this concept