Subcategories

• Workout 1A (Algebra)

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  G

  For the Your Turn, I noticed that -8 works also (instead of 7.) (-8)^3+(-8)^2=56*-8. 4096 is also a valid answer to the question.

• Workout 1B (Algebra)

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  Thank you

• Workout 2A (Geometry)

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  @FoxInABush

  Maybe your keyboard doesn't work, or something's wrong on your end.

• Workout 2B (Geometry)

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• Workout 3A (Combinatorics)

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  @thoughtfulmongoose
  I think the reason for this is because when you take the smaller one from each line (62 to 25) and add the remaining (24-1) the subset becomes {1,2,...62}, hence the 62.

• Workout 4A (Algebra)

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  For Q's 9 and 10 in the W2 test, it says a & b are integers when they're not. I think you meant positive numbers?

• Workout 5A (Number Theory)

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  The problem at the end of explanation #2 seems to overlook that no possible values of a are integers.

  If you calculate each value of a, they come out to be 67/6, 35/6, 25/6, and 17/6. Their sum is 24, but none of them are integers. So there are no possible integer values that satisfy that equation.

  The solution uses a trick to calculate the sum of all possible values without actually finding the values of a. So it overlooked the fact that there are no integer values of a.