
Math
Presentation
•
Mathematics
•
7th Grade
•
Hard
Joseph Anderson
FREE Resource
3 Slides • 6 Questions
1
Bentuk Aljabar
2
Bentuk aljabar
adalah suatu ekspresi/bentuk matematika yang terdiri dari kombinasi antara bilangan, variabel, dan operasi hitung (penjumlahan, pengurangan, perkalian, dan pembagian). Variabel ini biasanya diwakili oleh huruf seperti x, y, atau a. dst.
3
2. Perkalian: Kita dapat mengalikan suku-suku dengan menggunakan sifat distributif.
Contoh:
x . x = x2
3a . a = 3a2
4(a + 2) = 4.a + 4.2 = 4a + 8
5(2a - 3b) = 5.2a - 5.3b = 10a - 15b
2x(x + 3) = 2x.x +2x.3 = 2x² + 6x
3x2 (2x - 4y) = 3x2 . 2x - 3x2. 4y = 6x3 - 12x2y
(2a + 3) (a - 4) = 2a(a-4) + 3(a-4) = 2a2 - 8a + 3a - 12 = 2a2 - 5a - 12
(a + b)2 = (a + b) (a + b) = a (a + b) + b(a + b) = a2 + ab + ab + b2 =a2+b2
2a(a + 3b - 4) = 2a.a + 2a.3b - 2a.4 = 2a2 + 6ab - 8a
Ingat!!!
a x a = a2
-a x a = -a2
-a x -a = a2
4
Multiple Choice
a2 x a = .....
a2
3a
a3
2a2
5
Multiple Choice
-3a2 x 2ab
a2
3a
-6a3b
2a2
6
Multiple Choice
Hasil dari 5n (n + 3) adalah ....
5n + 3
5n2 + 15n
6n + 8n
5n2 + 8n
7
Multiple Choice
Hasil dari (x - 3) (x + 3) adalah ....
x2 + 9
x2 + 3
x2 - 9
x2 - 6
8
Multiple Choice
Hasil dari ( 2x - 1)(x + 3) adalah ....
2x2 - 3
2x2 - 5x - 3
2x2 + 5x + 3
2x2 + 5x - 3
9
Multiple Choice
Bentuk sederhana dari –2(2x2+3x–4)
–2x2+6x–8
–4x2–6x+8
–4x2+6x–8
–4x2–6x–8
Bentuk Aljabar
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