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=3x - 1
=(7x + 15y) - (5x - 9y)
=7x + 15y - 5x + 9y
=2x + 24y
= (2x - 2) (x + 5)
= 4x² + 10x - 2x - 10
= 4x² + 8x - 10
= 6x -3x +5 -6
= 3x -1
hasil pengurangan
7x + 15y -(5x-9y)
= 7x + 15y -5x + 9y
= 7x -5x + 15y + 9y
= 2x + 24 y
hasil perkalian
(2x - 2) (x + 5)
= 2xkuadrat + 10x - 2x -10
= 2xkuadrat + 8x -10