SPM 2017 Add Maths Paper 1, Question 12Quadratic Functions

Solved on video in English and Bahasa Melayu · 3 marks · Form 4, Quadratic Functions · 3:04 video

The question

Find the range of values of x such that the quadratic function f(x) = 6 + 5x - x² is negative.

[3 marks]

Step 1

We need 6 + 5x - x² < 0.

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

Final answer

x < −1 or x > 6

Where students lose marks

Watch out: −1 < x < 6 is where f(x) is positive. Negative means the two outer regions.

Watch every step of this question solved on video (3:04), with the reason behind each step and a box that checks your own answer.

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