Hi,

y = x^2 – 6x + 9     

y ' =   when x = 2  ⇒   y' = -2, the slope m of the tangent line

   y = mx + b

  y = -2x + b   ||Using Pt(2,1) to find b   |Note: when x = 2, y = 1   

  1 = -4 + b

  5 = b

  y = -2x + 5



 

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