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m = turunan y = x³ + 2x² - 5x
m = 3x² + 4x - 5
m = 3(1)² + 4(1) - 5
m = 3 + 4 - 5
m =2
persamaan garis y-b = m (x-a)
y+2 = 2 ( x-1)
y = 2x - 2 - 2
y = 2x-4 atau y-2x+4 = 0
semoga membantu :)