How can i do this?

Question

#(x-5)^2#

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Answer 1 · 2018-04-10T15:29:50

#x^2-10x+25#

#(x-5)^2#
Expand using the square of difference formula:
#(a-b)^2=a^2-2ab+b^2#
so in this case:
#(x-5)^2=x^2-10x+25#