(Solved): (1 point) The figure below shows \( f(x) \) and its local linearization at \( x=a, y=3 x-1 \). (Th ...

(1 point) The figure below shows \( f(x) \) and its local linearization at \( x=a, y=3 x-1 \). (The local linearization is shown in blue.) What is the value of \( a \) ? \[ a= \] What is the value of \( f(a) \) ? \[ f(a)= \] Use the linearization to approximate the value of \( f(1.4) \). \[ f(1.4)= \] Is the approximation an under- or overestimate? (Enter under or over.)