Solve for x :
log (x2 - 21) = 2
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Express log10 2 + 1 in the form of log10 x.
log10 (x - 10) = 1
log (x - 2) + log (x + 2) = log 5
log (x + 5) + log (x - 5) = 4 log 2 + 2 log 3