Alvis Oh's answer to :)'s Secondary 4 A Maths Singapore question.
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Date Posted:
3 years ago
In this case, getting rid of the denominator 4x^2 is okay because 4x^2 is always positive as long as x does not equal zero.
If the expression in the denominator can be positive or negative (eg x + 1), the inequality to solve becomes tricky (A Level stuff)
If the expression in the denominator can be positive or negative (eg x + 1), the inequality to solve becomes tricky (A Level stuff)
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