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PEMBAHASAN :
Gunakan sifat distributif
(a + b) (x + y)
= a(x + y) + b(x +y)
Jadi :
(2x + 3) . (4x - 5)
= 2x (4x - 5) + 3 (4x - 5)
= 8x² - 10x + 12x - 15
= 8x² + 2x - 15
Atau bisa juga, langsung kalikan seperti :
...|----------------|
.. |----------| .... |
(2x + 3) (4x - 5)
.......... |----| .... |
.......... |----------|
= 8x² - 10x + 12x - 15
= 8x² + 2x - 15
===========================
Kelas : 8
Mapel : Matematika
Kategori : Operasi Aljabar
Kata Kunci : Perkalian pada Aljabar
Kode : 8.2.1 (Kelas 8 Matematika Bab 1 - Operasi Aljabar)