factorise: 9z²-x²-4xy-4y²
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Answered by
6
Answer:
9z²-(x²-4xy+4y²)
9z²-{(x)²-2x2y+(2y)²}
9z²-(x-y)²
(3z)²-(x-y)²
(3z+x-y)(3z-x+y)
Step-by-step explanation:
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Answered by
3
Answer:
(3z+x-y) (3z-x+y)
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