factorise (x+y-z) +(x-y+z) + 2(x+y-z) (x-y+z)
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Step-by-step explanation:
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Answer:
4x^2 - 6zx -2yx - 2y^2 + 2z^2
Step-by-step explanation:
=(x+y-z) +(x-y+z) + 2x + 2y - 2z (x-y-z)
=x^2 + xy - zx + x^2 - yx + zx + 2x^2 + 2xy - 2zx - yx - y^2 + yz- xy + y^2 -yz - 2xy - 2y^2+ 2yz- zx - zy + z^2- zx +yz - z^2- 2xz- 2yz +2z^2
=4x^2 - 6zx - 2yx -2y^2 + 2z^2
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