Commonly asked in school and ‘O’ Level Examinations, many students also commit to commonly made mistakes. Watch the video (5 minutes) and see how you can add another 3 marks easily.
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I realize many students have a challenge with presenting the solution of proving question. I am going to illustrate the correct way using the following question.
Show that is always positive for all real values of x.
=> what is always +ve? the values of y not x ( x can be of any values)
=> The graph will not touch x-axis; it is “hanging” above the x-axis
=> No roots, hence discriminant is less than 0
TIPS FOR SHOWING/PROVING QUESTION
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Siginifance of Discriminant
: Type of Discriminant Determines The Types of Roots/Solutions ( No root, 1 real root or 2 real and distinct roots)
Hi,
I'm Ai Ling. I enjoy coaching students who have challenges with
understanding and scoring in 'O' Level A-Maths and E-Maths. 
