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Verified answer
Cari Y :f(x) = 2x² + 5x - 1
f(x) = 2(-2) ² + 5 (-2) - 1
f(x) = 8 - 10 - 1
f(x) = -3
(-2, -3)
Cari gradien :
f(x) = 2x² + 5x - 1
f'(x) = 4x + 5
f'(x) = 4(-2) + 5
f'(x) = -8 + 5
f'(x) = -3
PGS :
y - y1 = m (x - x1)
y - (-3) = -3 (x - (-2))
y + 3 = -3x - 6
y = -3x - 6 - 3
y = -3x - 9
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