Solution
Expression : $$(84)^{2} - (67)^{2} + \sqrt{?} = 2588$$
=> $$[(84 - 67) (84 + 67)] + \sqrt{?} = 2588$$
=> $$(151 \times 17) + \sqrt{?} = 2588$$
=> $$\sqrt{?} = 2588 - 2567$$
=> $$? = 21^2 = 441$$
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