Neco 2017 Mathematics Question 43

Practice objective / multiple choice question 43 from the 2017 Neco Mathematics examination.

Neco 2017 Mathematics Objective / Multiple Choice Hard Difficulty

Question 43 NECO • 2017 • MATHEMATICS • objective

Vectors \(\mathbf{a} = (2,-1,3)\) and \(\mathbf{b}\) satisfy \(\mathbf{a}\times\mathbf{b} = (4,8,-2)\) and \(\mathbf{a}\cdot\mathbf{b}=5\). Find the magnitude \(|\mathbf{b}|\).

A. \sqrt{\dfrac{218}{14}}

Correct Answer B. \sqrt{\dfrac{109}{14}}

C. \sqrt{\dfrac{109}{7}}

D. \sqrt{\dfrac{109}{28}}

Correct Answer

Correct Option:

\sqrt{\dfrac{109}{14}}

This is Neco 2017 Mathematics Question 43. It is one of the objective questions from the 2017 Neco Mathematics examination.

Difficulty level: Hard .

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