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a(a + 3b) + 2a(4a + 5b)
= a² + 3ab + 8a² + 10ab
Samakan sukunya.
= a²+8a² + 3ab+10ab
= (1+8)a² + (3+10)ab
= 9a² + 13ab
Atau karena FPB-nya sama dengan a:
= a(9a + 13)
= a^2 + 3ab + 8a^2 + 10ab
= 9a^2 + 13ab
Sekian ^_^