Answer:
x^2-10x+25
Explanation:
Distribute
(x-5)(x-5)
x(x-5)-5(x-5)
Distribute again
x^2-5x-5(x-5)
Distribute one last time
x^2-5x-5x+25
combine like terms
(a+b)^2=a^2+2ab+b^2 so a=x and b=-5 so the expression is x^2-10x+25
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