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08.12.2020 •
Mathematics
What is Sampson’s mistake?
A: Sampson should subtract 3 from both sides of the inequality.
B: Sampson should divide by -3 on both sides of the inequality.
C: Sampson did not change the direction of the inequality symbol after multiplying both sides of the inequality by a negative number.
D: Sampson’s father found no mistakes in his work and the answer is correct.
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Ответ:
C: Sampson did not change the direction of the inequality symbol after multiplying both sides of the inequality by a negative number.
-3 + 3 is zero but Sampson take it as (-3) which is wrong
Ответ:
Choice C
Sampson did not change the direction of the inequality symbol after multiplying both sides of the inequality by a negative number.
In short, the inequality sign must flip when we multiply both sides by a negative number.
After solving for x, the result should be x > -22.5
Ответ: