Question 443168
{{{(25-y)^2}}}
We know that {{{(a-b)^2}}} = a^2 -2ab +b^2, you can foil this out.
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So {{{(25-y)^2 = 625-50y+y^2}}}
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You can foil this out to check:
{{{(25-y)(25-y) =  625 - 25y - 25y +y^2  = 625-50y+y^2}}}