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(2x- √25 )(2x- √25 )
4x² -10x -10x +25
4x² + 25 -20x
(-4-b√9 )²=
16+12b +12b+9b² =
16+27b +9b²
( √4+3a)²=
( √4+3a)( √4+3a)
4+6a+6a+9a²
4+9a²+12a