hali2466 hali2466

26-02-2018
Mathematics

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suppose a classmate claims that the differnece between (x+2)2 and (x2+4) mist be 0. Is your classmate correct? Choose the best explanation.

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Zachdagreat Zachdagreat

27-02-2018

The two are not the same, even if you set x = -2, the second becomes 8, not 0 (your option B is in error as it did not square the negative as it should have).

If you subtract one from the other, you get:

(x + 2)² - (x² + 4)
(x² + 4x + 4) - x² - 4
4x

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