Take derivitive remember chain rule dy/dx=1/(x² ? 7x+1) times (2x ? 7) dy/dx=(2x ? 7)/(x² ? 7x+1) inputting x=7
the slope at x=7 is (14 ? 7)/(49 ? 49+1)=(14 ? 7)/(49 ? 50) the slope is (14 ? 7)/(49 ? 50) use point slope form y-0=(14 ? 7)/(49 ? 50)(x-7) y=(14 ? 7)/(49 ? 50)(x-7)
I'm going to take a wild guess that the ? means minus because you were able to type a plus sign in that case, it would be y=-2(x-7)
