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Add & subtract polynomials: find the error

Problem

Javier tried to subtract two polynomials. His work is shown below:
=(x43x2y2+y4)(11x4+4x2y23y4)=x43x2y2+y4+11x44x2y2+3y4Step 1=(13)x6+(3+1)y6+(114)x6+(4+3)y6Step 2=2x62y6+7x6y6Step 3
At which step did Javier make an error, if at all?
صرف 1 جواب چنو