ax2 - bx2 +ay2-by2+az2-bz2
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see in the attachment.
You should write that what to do with question.
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Step-by-step explanation:
taking all the 'a' terms together and 'b' terms together
( ax2 + ay2 + az2 ) - ( bx2 + by2 + bz2)
now taking out 'a' and 'b' common
a (x2 + y2 + z2) - b (x2 + y2 + z2)
we get
(a - b) ( x2 + y2 + z2)
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