3x2 + 9x - 30
= 3 ( x2 + 3x - 10 )
= 3 ( x2 + 5x - 2x - 10 )
= 3 [ x ( x + 5 ) - 2 ( x + 5 ) ]
= 3 ( x + 5 ) ( x - 2 )
3x2 + 9x - 30
= 3 ( x2 + 3x - 10 )
= 3 [ ( x2 - 2x ) + ( 5x - 10 ) ]
= 3 [ x ( x - 2 ) + 5 ( x - 2 ) ]
= 3 ( x + 5 ) ( x - 2 )
3x2 + 9x - 30
= 3( x2 + 3x - 10 )
= 3( x2 - 2x + 5x - 10 )
= 3[ x( x - 2 ) + 5( x - 2 ) ]
= 3( x - 2 )( x + 5 )