Aljabar 1. A= 2a + 5b + 8 B= a + 3b + 4 A + B = A - B = 2. A= x - 5y + 7 B= 2x + 4y -6 A + B = A - B =

Soal nomor 1 :
Diket : A = 2a + 5b + 8 , B = a + 3b + 4

Kumpulkan variabel yang sama
A + B
= (2a + 5b + 8) + (a + 3b + 4)
= 2a + a + 5b + 3b + 8 + 4
= 3a + 8b + 12

A - B
= (2a + 5b + 8) - (a + 3b + 4)
= 2a + 5b + 8 - a - 3b - 4
= 2a - a + 5b - 3b + 8 - 4
= a + 2b + 4

Soal nomor 2 :
Diket : A = x - 5y + 7 , B = 2x + 4y - 6

Kumpulkam variabel yang sama
A + B
= (x - 5y + 7) + (2x + 4y - 6)
= x - 5y + 7 + 2x + 4y - 6
= x + 2x - 5y + 4y + 7 - 6
= 3x - y + 1

A - B
= (x - 5y + 7) - (2x + 4y - 6)
= x - 5y + 7 - 2x - 4y + 6
= x - 2x - 5y - 4y + 7 + 6
= -x - 9y + 13