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7=x^2 - 2
9=x^2
3=x atau x=-3
jadi titik singgung (3,7) atau (-3,7)
y'=2x
m=y'(3)=2x=2.3=6
masukkan ke y-b=m(x-a)
y-7=6(x-3)
y-6x+11=0
y'=2x
m=y'(-3)=2x=2.-3=-6
y-7=-6(x-3)
y+6x-25=0