Status: Waiting for your answers. Problem: Solve for the variable. Check a value if it is extraneous. √ f + 7 = f - 5 f + 7 = ( f + )2 f + 7 = f2 + f + 0 = f2 + f + 0 = ( f + )( f + ) f1 = f2 = extraneous extraneous