(b) Equation of tangent to parabola $y^{2}16x\ at\ P(3,6)$ is $6y = 8(x + 3)$ $\Rightarrow 3y = 4x + 12$ $\Rightarrow 3y - 4x - 12 = 0\$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.