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Find the x-values (if any) at which f is not continuous. Which of the discontinuities are removable? (Enter your answers from smallest to largest. Enter NONE in any unused answer blanks.)f(x) = x + 4 / x² − x − 20a) 1) x = _______ ; 2)Removable , non-removable or N/A no discontinuityb) 1) x = _______ ; 2)Removable , non-removable or N/A no discontinuity