Mathematics, 30.10.2019 20:31 starreee
1. kalena was asked to prove ifx(x - 1)(x + 1) = x3 - x represents a polynomial identity. she
states that this relationship is not true and the work she used to justify her thinking is shown.
step 1: x(x - 1)(x + 1)
step 2: (x2 + x)(x - 1)
step 3: x3 - x2 - x2 - x
step 4: x3 - 2x2 - x
which statement correctly describes kalena's justification?
a. kalena is correct. there are no mistakes in her justification.
b. kalena made a mistake in step 2. the justification should state: (2x - x)(x + 1).
c. kalena made a mistake in step 3. the justification should state: x
- x.
d. kalena made a mistake in step 4. the justification should state: x3 + 2x2 - x
Answers: 1
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1. kalena was asked to prove ifx(x - 1)(x + 1) = x3 - x represents a polynomial identity. she
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