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It depends on whether the 4x4 refers to 4 ft by 4 ft, 4 inches x 4 inches or some other unit.
When a number is squared, it has been multiplied by itself. For instance: 4 squared means 4x4, which is equal to 16.
44x44= 1936 4x4=16 1,936+16=1,952
4x4 + 1 = (2x2 - 2x + 1)(2x2 + 2x + 1)
5x5=25 4x4=16 10x10=100 the square root, or '√' means to find what number times its self will equal that number. for instance: √100 = 10 because 10x10 = 100 √16 = 4 because 4x4 = 16 √49 = 7 because 7x7 = 49 √25 = 5 because 5x5 = 25