Question

please answer quickly and correctly


9and 10 you answer correctly I make brainlist ​

Answer 1

Note : For Question 10 refer to Attachment.

Let A, B, C and D be the four points where position vectors are a, b, c, and d respectively.

we have $\large\tt { AB^{ \longrightarrow}}$ = position vector of B-position vector of A

$\large\sf { AB^{ \longrightarrow} = b - a}$

$\large\sf { AC^{ \longrightarrow} = c - a}$

and similarly AD = d - a

Now the scaler triple product of the vectors

AB , AC and AD

Now solve further through grouping.

Answer 2

Explanation:

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