in a national spelling bee, the winning word means "a careless or indifference person". What word is it? To find out, match the expression with its simplest form. Write the letter above the correct answer.

-
x {}^{2} - 4x
2
−4
-
x {}^{2} + 2 {x} + 1x
2
+2x+1
-
6 {x}^{3} - 3 {x}^{2} + 15 {x}^{}6x
3
−3x
2
+15x

-
x {}^{2} + 9 {x}^{} + 20x
2
+9x
+20
-
x {}^{3} - 1x
3
−1
-
ac + ad + bc + bdac+ad+bc+bd
-
7 {a}^{2} b + 7abc7a
2
b+7abc
-
2 {x}^{2} + 3x + 12x
2
+3x+1
-
x {}^{2} - 10x - 24x
2
−10x−24
A͟n͟s͟w͟e͟r͟:


1._____
(+)(+)
2._____
(+2)(-2)
3._____
(+1)(-1)
4._____
(+2)(-2)
5._____
(+1)(+1)
6._____
(3)(22-+5)
7._____
(+2)(-12)
8._____
(+4)(+5)
9._____
(2+1)(+1)
10._____
(-1)(2++1)
11._____
(7)(+)
​