Question

Sederhanakan bentuk aljabar berikut
a. 4mn + 3(m² - 2n²) - 2(mn + m² - 2n²)
b. 10x (5 - 3x) - 3(5 - 3x)
c. 2(ab + 2ac - 7c) + 3ab - 2c(a + 3)
d. 3x²y - 3x(2y² - 5xy) - 2y(x² + 2xy)

Answer 1

jawabn soal a
= 4mn + 3(m² - 2n²) - 2(mn + m² - 2n²)
= 4mn +3m² -6n² -2mn -2m² +4n²
= 2mn + m² -2n²

jawaban soal b
= 10x (5 - 3x) - 3(5 - 3x)
= 50x -30x² -15 +9x
= -30x² +59x -15

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

jawaban soal d
= 3x²y - 3x(2y² - 5xy) - 2y(x² + 2xy)
= 3x²y - 6xy² - 15x²y -2x²y -4xy²
= -14x²y -10xy²