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x² - 8x + a = 0
ax² - bx + c = 0
a = 1
b = -8
c = a
ditanyakan c = a = ... ?
D = 0
b² - 4ac = 0
(-8)² - 4 (1)(a) = 0
64 - 4a = 0
64 = 4a
a = 64 ÷ 4
a = 16, jawabannya adalah a