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1-xy-20x^2y^2 please solve

factoring this equation

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Kirill Z. | Physics, math tutor with great knowledge and teaching skillsPhysics, math tutor with great knowledge...
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Variable change: z=xy
 
As a result of substitution, you will get the following expression:
 
1-z-20z2 . If you need to factor this, use quadratic formula:
 
z1,2=-[1±√(1+20*4)]/40=-(1±9)/40
z1=-1/4; z2=1/5; Therefore
 
1-z-20z2=(1-5z)*(4z+1)
 
Substituting xy for z, we will obtain final factoring:
 
1-xy-20x2y2=(1-5xy)*(4xy+1)
 
Since you did not specify what the equation is, I would leave the rest to you.