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Status: Waiting for your answers.

Problem: Solve for the variable. Check a value if it is extraneous.   √ z + 45  = z + 15   z + 45 = ( z + )2   z + 45 = z2 + z +   0 = z2 + z +   0 = ( z + )( z + )   z1 =     z2 = extraneous   extraneous