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2.
#f'(x) = 2x -3
#gradien
m= f'(4) = 2(4) -3 = 5
#pgs
y-3 = 5(x - 3)
y= 5x -12
3.
f'(x) = 6x^2 -6x - 12
#interval naik
6x^2 -6x -12 > 0
x^2 -x -2 > 0
(x-2)(x+1) >0
x = 2 atau x = -1
←—— ——→
(+) | (-) | (+)
———————
-1 2
naik pada interval x<-1 atau x>2