Factorise: a) (4y ^ 2 - 12xy + 9x ^ 2) - 4z ^ 2
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Step-by-step explanation:
.1 Factoring 9x2 - 12xy + 4y2. Try to factor this multi-variable trinomial using trial and error. Found a factorization : (3x - 2y)•(3x - 2y) ...
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