SPM 2017 Add Maths Paper 1, Question 3Vectors

Solved on video in English and Bahasa Melayu · 3 marks · Form 4, Vectors · 4:54 video

The question

Diagram 3 shows vectors AB, AC and AD drawn on a square grid with sides of 1 unit. (a) Find |-BA|. (b) Given AB = b and AC = c, express in terms of b and c: (i) BC, (ii) AD.

[3 marks]

SPM 2017 Add Maths Paper 1, Question 3: the question as drawn in Eduly's video4:54

Step 1

From the grid, AB moves 3 units left and 4 units down from A, so |AB| = sqrt(3² + 4² = 5 units.

4 more steps, each with the reason for it, in the full solution

Final answer

(a) 5 units (b)(i) c − b (ii) 2c − b

Where students lose marks

Watch out: −BA = AB (the two minus signs cancel), and C is the midpoint of BD, so BD = 2BC, not BC.

Watch every step of this question solved on video (4:54), with the reason behind each step and a box that checks your own answer.

Start 7 days freeAlready a member? Watch it now

No card. Every past-year question on video, in English and BM.

All questions in SPM 2017 Paper 1

Vectors: lessons and every past-year question

Baca dalam Bahasa Melayu

More Vectors questions

Questions are re-typeset by Eduly for study and commentary. Eduly is not affiliated with Lembaga Peperiksaan Malaysia or the Ministry of Education.