( x^2 - 25 ) = ( x + 5 ) ( x - 5 ) <--------------------------
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If x is equal to 5, then x squared plus 25 is equal to 50.
If x squared is not 5, then x is not equal to 5. Do not fall for the trap that the converse is "if x-squared = 25 then x = 5" since that is not a true statement.
30
(x - 12)(x + 12)
(x+3)(x-3)