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x2 23x equals 0
Since there are only terms in x2 and constants, but none in x, completing the square is not an option! x2 - 14 = 7 x2 = 21 and so x2 = sqrt(21)
25
To square a number (mathematically expressed as X2) you multiply it by itself. 49 is the square of the number 7, and 7 can be said to be the 'square root' of 49.