Determine (8x)^x if 8^(x + 2) = 504 + 8^x.
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Hence x^2-x-56=0. So x=7,-8. And x^2-x-6=0. So, x =-2, 3. Hence x=7,-8,-2,3. 6.3K views · ... If x + 1/x =5 then find the value of x^4 +1/x^4? 10,986 Views · If x ^4 +1/x^4 ... or,(x^2-8x+7x-56)(x^2-3x+2x-6)=0.
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