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y' = 4x - 5
absis = x = 2
y(x=2) = 2×(2)^2 - 5×2 + 7 = 8 - 10 + 7 = 5
titik singgungnya (2,5)
m = y'(x=2) = 4×2 - 5 = 8 - 5 = 3
pgs nya
y - y1 = m(x-x1) dgn (x1,y1) titik singgung
y - 5 = 3(x-2)
y - 5 = 3x - 6
y = 3x - 1
y - 3x = -1
3x - y = 1
3x - y - 1 = 0
smga mmbantu