ote that f is continuous on (, 4) and (4, ). For the function to be continuous on (, ), we need to ensure that as x approaches 4, the left and right limits match. First we find the left limit.

limx4f(x)=limx4(cx² + 7x)=

Next, we find the right limit.

limx4⁺f(x)=limx4⁺(x³ cx)=