Question

If the equation of the normal to the curve $𝑦= 𝑥−𝑎 (𝑥+𝑏)(𝑥−2)$ at the point $(1,−3)$ is $𝑥−4𝑦=13$, then the value of $𝑎+𝑏$ is equal to ___ .

Answer 1

The answer is -6.