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Maths P3 9709 M/J 2010 (1st variant) Qn1

G

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Finding Modulus Question
I use the method of squaring both the sides, so when i did, i reached till the step:

-3x^2 + 22ax - 7a^2 > 0

its a quadratic eqn but how to to solve it with (a) ?? :unknown:
 
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