Factorise 4x^2-4√7x+7
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4x^2 - 4√7x + 7
4x^2 - 2√7x - 2√7x + 7
2x ( 2x - √7 ) - √7 ( 2x - √7 )
( 2x - √7 )( 2x - √7 )
( 2x - √7 )^2
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