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5.a) 5a + 8 + 8a + 3
= (5a + 8a) + (8 + 3)
= 13a + 11
b) 6a - 5b - 2c - 8a + 6b + 9c
= (6a - 8a) (-5b + 6b) (-2c + 9c)
= -2a + b + 7
c) 5p(4p - 3) dan 7p(3p + 4)
= 20p^2 - 15p + 21p^2 + 28
= (20p^2 + 21p^2) -15p +28
= 41p^2 - 15p + 28
d) 4x(2x^2 - 3x + 5) dan 3x(4x^2 + 9x - 8)
= 8x^3 - 12x^2 + 20x + 12x^3 + 27x^2 - 24x
= (8x^3 + 12x^3) (-12x^2 + 27x^2) (20x - 24x)
= 20x^3 + 15^2 - 4x
6. Jika dikurangkan dari yang depan menjadi :
a) 7p + 14 - 9p + 12
= (7p - 9p) (14 + 12)
= -2p + 26
b) 2p^2 + 15p - 18 - 11p^2 - 17p + 24
= (2p^2 - 11p^2) (15p - 17p) (-18 + 24)
= -9p^2 - 2p + 6
c) -8x + 10y - 9z - 4x - 11y - 9z
= (-8x - 4x) (10y - 11y) (-9z - 9z)
= -12x - y - 18z
d) -5(4y^2 - 2y + 8) dari 4(7y^2 + 6y - 5)
= -20y^2 + 10y - 40 - 28y^2 + 24y - 20
= (-20y^2 - 28y^2) (10y + 24y) (-40 - 20)
= -48y^2 + 34y - 60
Kalau maksudnya dikurangkan dari yang belakang, tinggal dibalik saja.
Contoh : a) 9p + 12 - 7p + 14