Prove the tangent to the curve at the point (2, 0) and (3, 0) are at right angles.
We know that if the slope of two tangent of a curve are satisfies a relation m1m2 = -1, then tangents are at right angles
m1 at (2, 0) = -1
m2 at (3, 0) = 1
m1m2 = (-1)(1) = -1
So, we can say that tangent at (2, 0) and (3, 0) are at right angles.