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Verified answer
M=2ax+b dengan x = 0 dan gradien -2 (tegak lurus persamaan)-2 = 2a(0) + b
b = -2
karena menyinggung maka D= 0
b^2-4.a.c=0
(-2)^2-4.a.1=0
4=4a
maka a=1 (C)