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Status: Waiting for your answers.

Problem: Solve for the variable. Check a value if it is extraneous.   √ d + 15  = d + 9   d + 15 = ( d + )2   d + 15 = d2 + d +   0 = d2 + d +   0 = ( d + )( d + )   d1 =     d2 = extraneous   extraneous