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They searched everywhere but could not see it any more. It had solved itself!
There is no "hardest" problem. Something that you might find hard might appear easy to someone else and conversely. Also, some of the harder problems do not have solutions yet - if they had been solved then they could not have been so hard!
The equation cannot be solved without an '= ###'. If it was a^2-6a-16=0, then a could equal 8 or -2.
YES
There are a lot of problems like a bruised liver and appendix that could be an issue. If your side continues to hurt, it is best to consult a doctor.