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Status: Waiting for your answers.

Problem: Solve for the variable. Check a value if it is extraneous.   √ q + 72  = q + 16   q + 72 = ( q + )2   q + 72 = q2 + q +   0 = q2 + q +   0 = ( q + )( q + )   q1 =     q2 = extraneous   extraneous