Question

If the planes $\overrightarrow{r}.(2\hat{i}-\lambda\hat{j}+3\hat{k})=0$ and $\overrightarrow{r}.(\lambda\hat{i}+5\hat{j}-\hat{k})=5$ are perpendicular to each other ,then value $\lambda^2+\lambda$ is :

• A. 0
• B. -2
• C. -1
• D. 2

Answer 1

Answer: (A)

0

Answer 2

The correct option is (A): 0