The book has a problem
(x-3)(x^2 – 7x – 2)
which results in an answer of
x^3 – 10x^2 – 2x +19x + 6
The solution is incorrect in the new solutions manual ( the one with a bee on the cover)
However, it is correct in the old solutions manual -the one with a chess set on the cover.
In Chp. 10, Lesson 4, Set III Question 4 the textbook asks “Why is QD/AC = DB/CD?”
Shouldn’t it be DB/CB instead of DB/CD?
Dr. Callahan Answered:
Again you are correct. This is an error in the new printing of the 3rd edition by My Father’s World.
Question from Kerry:
The answer key gives 5 statement answers, but the proof only has 4 statements. I don’t know which of the 5 in the answer key is extraneous. Assuming the last one should be dropped, the answer in the key for statement 2 is subtraction, but I think it is addition. There is no subtraction for statement 2. Could you clarify/verify the 4 correct reasons for the 4 steps?
Answer from Dr. Callahan:
This should be
1) Given2) Addition3) Given4) Substitution
The answer key you have is a reprint from the original (oddly the original has the correct answers) and is new. We will document any errors at askdrcallahan.com/support.
Question from Luke:
In Jacob’s Geometry Chapter 3, Lesson 4, Number 36 – Something seems wrong with the proof? Help?
Answer from Cassidy:
Yes Luke – good call!
It has a typo in line 3 of the proof. It should say PC besects <APB.