Asked by mema
solving the equation (x+4)(x-4)=9 Eric stated that the solution would be x+4=9>x=5 or (x-4)=9=>x=13
However one of these solution fails to work when subsituted back to the original equation. Why?olve and explain the reasoning. Can someone please help me?
However one of these solution fails to work when subsituted back to the original equation. Why?olve and explain the reasoning. Can someone please help me?