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Mathematics, 12.08.2020 05:01 munozjosue258
Adrian solved the equation x2+9=16 using the following steps.
Review his work carefully, and then follow the instructions.
Line 1: x2+9=16
Line 2: x+3=±4
Line 3: x+3−3=±4−3
Line 4: x=1 and x=−7
Which statement identifies a mistake Adrian made, if any?
1) In Line 2, he should have subtracted 9 from both sides of the equation because it is not part of the expression that is squared.
2) He did not make a mistake. His answer is correct.
3) In Line 3, he should have added 3 to both sides of the equation to get ±4+3.
4) In Line 4, he subtracted incorrectly. The solutions should be x=±1 and x=±7.
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Answers: 1
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Adrian solved the equation x2+9=16 using the following steps.
Review his work carefully, and then f...
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