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Factorise 4x ^(2) + 9y ^(2) + 25 z ^(2) ...

Factorise `4x ^(2) + 9y ^(2) + 25 z ^(2) - 12 xy - 30 yz + 20 zx`

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The correct Answer is:
`(2x - 3y + 5z) (2x - 3y + 5z)`
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