[tex]a) (p+4)(p-2)=p^{2}-2p+4p-8=p^{2}+2p-8[/tex]
[tex]b) (-3+a)(a-4)=-3a+12+a^{2}-4a = -7a+12+a^{2}[/tex]
[tex]c) (2x+5)(x+3)=2x^{2}+6x+5x+15 = 2x^{2}+11x+15[/tex]
[tex]d) (4m+1)(2m-5) = 8m^{2}-20m+2m-5=8m^{2}-18m-5[/tex]
[tex]e)(5-p)(4+3p)=20+15p-4p-3p^{2}= -3p^{2}+11p+20[/tex]
:)