x2+7x+12
=x2+4x+3x+12
=x(x+4)+3(x+4)
= (x+3)(x+4)
c1 . x2 + 7x + 12
= x2 + 6x + 32 + 3 + x
= ( x + 3)2 + ( x + 3)
= ( x + 3)( x + 4)
c2 . x2 + 7x + 12
= x2 + 3x + 4x + 12
= x( x + 3) + 4( x + 3)
= ( x + 3)( x + 4)
c3 . x2 + 7x + 12
= x2 + 3x + 4x + 12
= x( x + 4) + 3( x + 4)
= ( x + 3)( x + 4)
c4 . x2 + 7x + 12
= x2 + 8x + 42 - 4 - x
= ( x + 4)2 - ( x + 4)
= ( x + 4)( x + 3)
c5 . x2 + 7x + 12
= x2 + 7x + 21 - 9
= ( x - 3)( x + 3) + 7( x + 3)
= ( x + 3)( x + 4)
c6. x2 + 7x + 12
= x2 + 7x + 28 - 16
= ( x + 4)( x - 4) + 7( x + 4)
= ( x + 4)( x + 3)