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Catching some Zs

Algebra Level pending

After multiplication and being written as a polynomial, \( (a+b)(x+y+z) \) includes the term \( 2z^2 .\) What must be true?

\[ a = b = z \] \[ a = b = \sqrt{z} \] \[ a = z - b \] \[ a = b^2 \]

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by Jason Dyer

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