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X = 5a+3
Y = 3a+3
Z = 4a-8
Jawab :
K = X+Y+Z
K = (5a+3)+(3a+3)+(4a-8)
K = 12a-2
Maaf jika ad kesalahan :)
25a² - 30a + 9 = 9a² + 18a + 9 + 16a² - 64a + 64
25a² - 30a + 9 = 25a² - 46a + 73
16a = 64
a = 4
5(4) - 3 =17
3(4) + 3 = 15
4(4)-8 = 8
Jd kelilingnya 17 + 15 + 8 = 40 cm
Jawab: C.
Itu salah soal kali, klu 5a - 3 nilai a nya bisa ditentukan.