$7\mathrm{.}87$ and $7\mathrm{.}88$ For the beam and loading shown, $($a$)$ write the equations of the shear and bending$-$moment curves, $(\backslash ($ b $\backslash ))$ determine the magnitude and location of the maximum bending moment.

Fig. P$7\mathrm{.}87$

Fig. P$7\mathrm{.}88$