6.XXX
X
12
X2+bX=cX
Solve XXX XXXXXXXXXX. C=XX
XX= 6.X(12/XX)= X kN
XX= X.5(X/13)= X.5 XX
F= -6i-X.XX kN, since both XX and XX XXX XXXXXXX in XXX negative XXXXXXXXX (XXXX and left)