For the following beam develop shear and moment functions using free body diagram of a

cut section to represent the region $x<mn>3</mn><mi>m</mi>$ and $x>3m.$ Do not use the graphical approach

for this problem. $($Answer to check: $M=\{-4x^2+26x-12\}kN-m$ for $x>3m)$

For the following beam develop shear and moment functions using free body diagram of a

cut section to represent the region $x<mn>6</mn><mi>f</mi><mi>t</mi>$ and $x>6ft.$ Do not use the graphical approach

for this problem. $($Answer to check: $M=\{-x^2+30x-216\}k-ft$ for $x<mn>6</mn><mi>f</mi><mi>t</mi><mtext></mtext><mi>)</mi>$

For the following beam develop shear and moment functions using free body diagram of a cut section to represent the region $x<mn>3</mn><mi>m</mi>$ and $x>3m.$ Do not use the graphical approach for this problem. $($Answer to check: $M=\{-4x^2+26x-12\}kN-m$ for $x>3m)$