bonjour

g=4(3x-2)+8

=12x-8+8

=12x

h=3(6a-b)+2(5b-9a)

=18a-3b+10b-18a

=-3b+10b

=7b

i=(a+3)(b+5)

=ab+5a+3b+15

j=(2x+1)(3y+2)

=6xy+4x+3y+2

k=(3x+4)(2x+5)

=6x²+15x+8x+20

=6x²+23x+20

l=(x-5)(2x+1)

=2x²+x-10x-5

=2x²-9x-5

m=(3x-2)(4x-5)

=12x²-15x-8x+10

=12x²-23x+10

n=(7x+1)(2x-3)

=14x²-21x+2x-3

=14x²-19x-3