4 m long ladder touches the cube 1mx1m at the wall. How high reach on the wall?

Correct result:

q1 =  1.3622 m
q2 =  3.7609 m


l=4 f(x)=kx+q f(1)=1 f(x0)=0 k=1/(1x0) q=1k x01=3.7609 x02=1.3622 k1=1/(1x01)=1/(13.7609)0.3622 q1=1k1=1(0.3622)1.3622=1.3622 m l1=q12+x012=1.36222+3.760924
k2=1/(1x02)=1/(11.3622)2.7609 q2=1k2=1(2.7609)3.7609=3.7609 m l2=q22+x022=3.76092+1.36222=4

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