If you meant x2 = 16 then take square root both sides which gives x = 4 but you need to see that -42 is also 16 so that is another solution.
The two solutions are 4 and -4.
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Equals anything... x is a variable. If that equation was set equal to zero then you could solve for x, but that is not what you have asked.
x=18
(2x)ysquared
144X = X2 144X - X2 = 0 (144 - X)X = 0 X = 0 or X = 144
x = +13x = - 13