tolong bantuannya ya..

a) P (1, 5) pada y = 3x^2 + 2x
y' = m = 6x + 2
x = 1 => m = 6.1 + 2 = 8
y - y1 = 8 ( x - x1)
y - 5 = 8 (x - 1)
y - 5 = 8x -8
y = 8x -3
b) P ( -2, -21) pada y = -5x^2+3x+5
y' = m = -10x + 3
m = -10(-2) + 3
m = 23
y - y1 = m (x - x1)
y - - 21 = 23 (x - - 2)
y + 21 = 23x + 46
y = 23x + 25