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☆ (p-4)(p^2+4p+16)
= p(p^2+4p+16)-4(p^2+4p+16)
= p^3+4p^2+16p-4p^2-16p-64
= p^3-64
☆ (p^2-4)(2p^2+3p-5)
= p^2(2p^2+3p-5)-4(2p^2+3p-5)
= 2p^4+3p^3-5p^2-8p^2-12p+20
= 2p^4+3p^3-13p^2-12p+20
☆ (3p+2)(9p-6p+4)
= 3p(9p-6p+4)+2(9p-6p+4)
= 27p^2-18p^2+12p+18p-12p+8
= 9p^2+18p+8
☆ (3p-1)(4p-5p-6)
= 3p(4p-5p-6)-1(4p-5p-6)
= 12p^2-15p^2-18p-4p+5p+6
= -3p^2-17p+6
☆ (2x-1)(4x^2+2x+7)
= 2x(4x^2+2x+7)-1(4x^2+2x+7)
= 8x^3+4x^2+14x-4x^2-2x-7
= 8x^3+12x-7