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# Factorise: 9x2 + 4y2 + z2 -12xy +4yz - 5zx.Hence find its value when x=1,y=2 and z=-1

Asked by nisha_vini29 24th March 2017, 5:19 PM

Hi Nisha,

Here is your solution. And the coefficient of zx is -6 not -5. This makes it impossible to use the identity. This was why we took time to solve this. Hope this clears your doubt Nisha.

Answered by Expert 27th March 2017, 6:47 PM

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