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Mathematics, 28.01.2020 19:03 roxygirl8914

Justify each step of the proof.

conjecture: if 2(x2 + 5) = 60, then x is 5 or –5.

1. 2(x2 + 5) = 601. given

2. 2x2 + 10 = 602.distrubutive law

3. 2x2 = 503. equals subtracted from equal, remainders are equal.

4. x2 = 254. equals divided by equals quotients are equal.

5. x = ±55. square roots of equals are equal.

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Justify each step of the proof.

conjecture: if 2(x2 + 5) = 60, then x is 5 or –5.
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