This is a curved line.When x=-3,y=x^2-4.There are seven points on the line and the seventh point is x=3.So,draw the tangent at x=-2 and find its gradient.Thanks
Given equation of the curve
differentiate (i) with respect to x
Thus gradient (slope)=-4
The equation of tangent at `(x_1,y_1)` and slope m is .
when x=-2 then y=0
Thus equation of tangent at (-2,0) and slope -4 is