why is this wrong subtracted polynomial wrong?

0 ⤊

16a^2-32a+9 from 12a^2+60a-8
and i get

4a^2+28a+1

2007-07-26 16:12:13 · 4 answers · asked by percy m 1 in Science & Mathematics ➔ Mathematics

12a^2 + 60a - 8 -[16a^2 - 32a + 9]

12a^2 + 60a - 8 - 16a^2 + 32a - 9

-4a^2 + 92a - 17

2007-07-26 16:15:52 · answer #1 · answered by rivaldo 1 · 0⤊ 0⤋

16a^2-32a+9 from 12a^2+60a-8
12a^2+60a - 8 -(16a^2 -32a +9)
= 12a^2 +60a -8 -16a^2 +32a - 9
= -4a^2 +92a -17

2007-07-26 23:21:13 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋

It should be
-4a^2 +92a -17.

You have your positive and negative signs confused.
.

2007-07-26 23:16:28 · answer #3 · answered by tsr21 6 · 0⤊ 0⤋

change all the signs from the second term

2007-07-26 23:16:54 · answer #4 · answered by michelle 2 · 0⤊ 0⤋