Hi,

4^(log2(3+x)) = 2x^2+8x+10  

(2^2)^(log2(3+x)) = 2x^2+8x+10  

(2)^(2log2(3+x)) =2x^2+8x+10  

 (2)^(log2(3+x)^2) = 2x^2+8x+10     

        (3+x)^2) = 2x^2+8x+10  

     9 + 6x + x^2 = 2x^2+8x+10  

          x^2 + 2x + 1 = 0  Factor

          (x+1)(x+1) = 0 ,  x = -1 

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