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f(x) = -x² + px + 1
m = f'(x) = -2x + p
gradien di x = 1
2 = -2.1 + p
2 = -2 + p
4 = p
f(x) = -x² + 4x + 1
x = 1, f(1) = -(1)² + 4.1 + 1 = 4
titik singgung (1, 4)
persamaan garis singgung :
y - y1 = m(x - x1)
y - 4 = 2(x - 1)
y - 4 = 2x - 2
y = 2x + 2