alleryWhat does (x + y - z)^2 expand to?
Ax^2+y^2+z^2-2xy-2yz-2zx
Bx^2+y^2-z^2+2xy-2yz-2zx
Cx^2+y^2+z^2+2xy-2yz-2zx
Dx^2+y^2+z^2+2xy+2yz+2zx
Answer & Solution
Correct answer: C. x^2+y^2+z^2+2xy-2yz-2zx
Replacing c with -z in the trinomial expansion formula makes the cross terms involving z negative.
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