Question

Factorise 81x square minus 4y square minus z square plus 4yz

Answer 1

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81x^2 - (4y^2 - z^2 + 4yz)
81x^2 - 4y^2 + z ^2 - 4 yz

81x^2 - ( 2y + z )^2

( 9x )^2 - ( 2 y + z ) ^2


(9x - 2y - z ) ( 9x + 2y + z )