substitute (35-x)^2 with explanations please
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(a-b)²=a²+b²-2ab
(35-x)²=35²+x²-70x
=1225+x²-70x
=x²-70x+1225
x²-35x-35x+1225
x(x-35)-35(x-35)
(x-35) (x-35)
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