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garis g tegak lurus dengan garis y = 1/2 x - 4
gradien g (mg)
mg.m = - 1
mg.1/2 = - 1
mg = -2
mg = f '(x)
-2 = 2x - 4
x = 1
y = 1² - 4.1 + 2 = -1
garis g menyinggun kurva di titik (1, -1)
Persamaan garis g:
y + 1 = -2(x - 1)
y + 1 = -2x + 2
y = -2x + 1
garis g memotong sumbu y → x = 0
y = -2.0 + 1 = 1
Jadi garis g memotong sumbu y dititik (0, 1)