The value of for which the equation has coincident roots is:

MATHEMATICS · Numerical · A Level · Mathematics · Exponentials and logarithms · Exponentials and logarithms

Problem

The value of b>0b>0 for which the equation 2log⁡1/25(bx+28)=−log⁡5(12−4x−x2)2\log_{1/25}(bx+28)=-\log_5(12-4x-x^2) has coincident roots is:

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