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Kalian semua pasti pernah denger aljabar dong? Aljabar adalah salah satu cabang matematika. Dalam pemecahan masalahnya bakal dipakai huruf-huruf buat mewakili angka-angka.
Aljabar sendiri asalnya dari bahasa Arab dan penemunya bernama Al-Khawarizmi. Al-jabr sendiri artinya penyelesaian.
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aljabar (mometrix.com)
Nah, sekarang yuk kita belajar beberapa operasi hitung aljabar dengan contoh soalnya. Ini adalah beberapa dasar-dasar yang harus kalian pahami.
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aljabar (byjus.com)
1. Subtitusi
Tiap variabel kalo diketahui nilainya berati perhitungannya diganti pakai yang udah diketahui. Simak contohnya berikut.
Soal: Berapa nilai dari a ( b + 5), jika a = 3 dan b = 4?
Jawab: a ( b + 5) jika a = 3 dan b = 4. Maka, kita ganti a dengan 3, b dengan 4 menjadi 3 (4 + 5). Oleh karena itu jawabannya adalah 27.
2. Asosiatif
Di sini, kita perlu mengelompokkan suku variabel yang sejenis. Hal ini agar mudah dioperasiin atau dihitung aja. Lihatlah contoh berikut dan pahami.
Misalnya, ada soal 2x+5y+6+2y+3x+1 = ... ?
Jawab: Kita akan mengelompokkan suku sejenis menjadi 2x+3x+5y+2y+6+1. Kemudian kita hitung menjadi 5x+7y+7.
3. Distributif
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