Status: Waiting for your answers. Problem: Solve for the variable. Check a value if it is extraneous. √ a - 1 = a - 7 a - 1 = ( a + )^{2} a - 1 = a^{2} + a + 0 = a^{2} + a + 0 = ( a + )( a + ) a_{1} = a_{2} = extraneous extraneous