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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
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
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
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
FACTORING ax2 + bx + c Think “unfoil” Work down, Show all steps.
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