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Question

Mathematics Question on Vectors

If aˉ×bˉ=7i^+9j^+10k^\bar{a}\times\bar{b}=7\hat{i}+9\hat{j}+10\hat{k} and aˉbˉ=20\bar{a}\cdot\bar{b}=-20, then aˉ2bˉ2=|\bar{a}|^{2}|\bar{b}|^{2}=

A

530

B

580

C

400

D

630

E

560

Answer

630

Explanation

Solution

The correct option is (D) : 630