Clarification on problems in the Foundation of Math book

[gregory.yazejian]

Pg. 67 drill set 2 drill 4 problems 3 and 5. The answer explanations provided do not make sense to me. Please reply as they might be wrong in the book.

[Ben Ku]

Thanks for catching the typos. These revisions should make more sense.

p. 67 Set 2 Drill 4, No. 3, the question should be
x^3 - 3x^2 - 28x = 0

p. 67 Set 2 Drill 4, No. 5, the question should be
-3x^3 + 6x^2 + 9x = 0

I hope this makes sense.