Question

Sederhanakan bentuk aljabar berikut :
a. 10x(5-3x)-3(5-3x)
b. 2(ab+2ac-7c)+3ab-2c(a+3)

Answer 1

A. 10x(5-3x) - 3(5-3x)
= 50x -30x pangkat 2 - 15 + 9x
= -30 pangkat 2 + 50x + 9x -15
= -30 pangkat 2 + 59x -15

2. 2(ab+2ac-7c) + 3ab - 2c(a+3)
= 2ab + 4ac-14c + 3ab -2ac -6c
= 2ab + 3ab + 4ac -2ac-14c-6c
= 5ab + 2ac -20c

Answer 2

a. 10x (5 - 3x) - 3 (5 - 3x)
= (10x × 5) (10x × -3x)  (-3 × 5) (-3 × -3x)
= 50x - 30x² - 15 + 9x
= -30x² + 50x + 9x - 15
= -30x² + 59x - 15

b. 2 (ab + 2ac - 7c) + 3ab - 2c (a + 3)
= (2 × ab) (2 × 2ac) (2 × -7c) + 3ab (-2c × a) (-2c × 3)
= 2ab + 4ac - 14c + 3ab - 2ac - 6c
= 2ab + 3ab + 4ac - 2ac - 14c - 6c
= 5ab + 2ac - 20c