3 (2x-5) = 6x – 15

2x (-4x+3) = - 8x²+6x

2a(3a-5b) = 6a² -  10ab

5a (-4a -5b) = -20a²-25ab

(2+x)(5-x) = 10 –2x +5x –x²

                 = 10 +3x –x²

(2x-1)(3x+2) = 6x²+4x-3x-2

                      = 6x²+x -2

(1-3x)(5-x) = 5 – x – 15x  + 3x²

                   =  5– 16x  + 3x²

(-2x+3)(-5x-4) = 10x²+8x-15x-12

                         = 10x² – 7 x-12

( 3x - 1 ) ( 2 - 5x ) = 6x –15x²- 2 + 5x

                              = –15x²+ 11x- 2

3 ( 5x + 2 ) = 15x +6

(2a+b)(a+2b) = 2a²+4ab+ab+2b²

                       = 2a²+5ab+2b²

(5 - a)(5 - a) = 25 –5a-5a+a²

                     = 25 –10a + a²

A = 2x + (2x-3) - (3x+2) - (2-3x)

A = 2x + 2x-3 – 3x - 2 – 2+3x

A = 4x - 7

B = 2x (2x-3) - (3x+2) (2-3x)

B = 4x²-6x- [ 6x-9x²+4-6x]

B = 4x²-6x -  6x+9x²-4+6x

B = 13x² – 6x -4

C = 2x + (2x-3) (3x+2) - (2-3x)

C= 2x + 6x² +4x –9x –6 –2 + 3x

D = (2x-3) (2x-3) – 4x (3x+2) – 3x (-2-3x)

D = 4x²-6x-6x+9-12x² –8x +6x+9x²

D = x² –14x +9