F(x)=25x²-16
x₀=-2
1) f `(x) = (25x²-16)`= 25*2x = 50x
2) f `(x₀)= f `(-2) = 50*(-2) = -100
3) f(x₀) = f(-2) = 25*(-2)²-16 = 25*4-16 = 100-16 = 84
4) y=f(x₀)+f `(x₀)(x-x₀)
y=84+(-100)(x-(-2))
y=84-100(x+2)
y=84-100x-200
y=-100x-116 - уравнение касательной