proof that (a-x)(x-a)=-x²+2xa-a²
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LHS = (a -x)(x-a) = a(x-a)-x(x-a)
ax-a²-x²+ax= 2ax-a²-x²=RHS
Hence proved
ax-a²-x²+ax= 2ax-a²-x²=RHS
Hence proved
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