tegak lurus, maka a.b = 0
(x,-4).(2x,2x) = 0
2x^2 - 8x = 0
2x(x-4) = 0
x = 0 atau 4
maaf kalau salah
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tegak lurus, maka a.b = 0
(x,-4).(2x,2x) = 0
2x^2 - 8x = 0
2x(x-4) = 0
x = 0 atau 4
maaf kalau salah