In the book, Algebra Demystified," the author presents this problem as
the part of the final book review (problem #57):
4x(x-3) - 5(3x-6) = (2x - 3)2
The author's answer is 7/5, which is correct.
However, when I solve the problem I get something entirely different,
namely:
(4x2 - 12x) - (15x - 30) = 4x2 - 12x + 9
4x2 - 27x + 30 = 4x2 - 12x + 9
-27x + 30 = -12x + 9
21 = 25x
which is obviously different from the author's solution.
Can someone please show me where I screwed up the calculation?
Thanks in advance.
Henrysun909
