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When a student was directed to factor x4 – 81 completely, his teacher did not give
him full credit for the answer (x2 + 9) (x2 - 9). The student argued that since his
answer does indeed give x4 - 81 when multiplied out, he should be given full credit.
Was the teacher justified in her grading of this item? Explain. Asap​

Sagot :

Rowelizaidn

Answer:

The teacher was justified in her grading of this item.

Step-by-step explanation:

(x² - 9) can still be factored to (x + 3)(x - 3), thus the correct answer is (x² + 9)(x + 3)(x - 3).

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