(-43)2 = 1,849
(same as +43 squared)
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3 + 43 = 46 7 squared = 49 46 + 49 = 95
It lies between 1848 and 1850. See if you can figure out what it is!
Apart from writing out the answer it is hard to help you because we do not know what the difficulty is here: 422 is 16x2, and 523 is 25x3 and the difference is 43. Or perhaps you mean 4xsquared 2 - 5x squared 3, but even then we don't know what the difficulty is.
3x2 -4 (x=3)3(32)-43(9)-427-4=23
9x squared-15x squared = -6