Разложить на множители квадратный трехчлен,

1)

  x²+3x-88 =

=  x²+11x - 8x - 88 =

= (x²+11x) - (8x + 88) =

= x·(x+11) - 8·(x + 11) =

= (x+11)·(x -8)

2)

    2x² - 3x + 1 =

=  2x²- 2x - x + 1 =

=  (2x²- 2x) - (x - 1) =

=  2x·(x- 1) - 1·(x - 1) =

= (x- 1)·(2x - 1)

3)

    3x² + 11x - 14 =

=  3x² + 14x - 3x - 14 =

=  (3x² - 3x)+ (14x - 14) =

=  3x·(x - 1)+ 14·(x - 1) =

=  (x - 1)·(3x + 14)