1. ax2 + bx + c 2x2 + 11x + 5 ac 2(5) =10 1 10 b =11 ( ) 2x2 + 10x + 1x
( )
2x2 x x
( )
+ 5 2x
(x ) 1
(x )
(2x )(x + 5) check it by foiling

2. ax2 + bx + c 3x2 + 5x + 2 ac 3(2) =6 2 3 b =5 ( ) 3x2 + 3x + 2x ( )
( )
3x2 x x
( )
+ 2 3x
(x ) 2
(x )
(3x )(x + 1) check it by foiling

3. ax2 + bx + c 2x2 + 21x - 11 ac 2(-11) =-22 -1 22 b =21 ( ) 2x2 + 22x
( )
2x2 x x
( )
+ -11 2x
(x ) -1
(x )
(2x )(x ) check it by foiling

4. ax2 + bx + c 8x2 + -14x - 15 ac 8(-15) =-120 6 -20 b =-14 ( ) 8x2
( )
8x2 x x
( )
+ -15 4x
(2x ) 3
(2x )
(4x )(2x - 5) check it by foiling