a²x+b²(1-x)≥[ax+b(1-x]²a²x+b²(1-x)≥a²x²+2abx(1-x)+b² (1-x)²[a²x²-a²x ]+2abx(1-x)+[b² (1-x)²- b²(1-x)]≤0a²x(X-1) +2abx...