Logarithms never go amiss

Algebra Level 2

Let p p and q q be the roots of the quadratic equation 4 x 2 24 x + 96 4x^2-24x+96 . Find the value of log 3 2 ( 6 p + 6 q ) \log_{3}2(\frac{6}{p}+\frac{6}{q})


The answer is 1.

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2 solutions

By Vieta Formula, we get: p + q = 6 p+q = 6 and p q = 24 pq = 24 . Now we factor first the logarithm log 3 2 ( 6 p + 6 q ) \log_{3}2(\frac{6}{p}+\frac{6}{q}) \implies log 3 2 ( 6 ( p + q ) p q ) \log_{3}2(\frac{6(p+q)}{pq}) then substitute the values of p + q p+q and p q pq and solve to get log 3 2 ( 1.5 ) \log_{3}2(1.5) log 3 3 \log_{3}3 = 1 =\boxed { 1}

Agali Paavani
Dec 21, 2014

p+q=6,pq=24 log2(6p+6q)/pq =log2.6.6/24 =log3 =1

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