Question

упростите выражение (х-5) во 2 степени + (х-5)(х+5)
 

Answer 1

(x-5)(x-5) + (x-5)(x-5)= (x-5)(x-5+x-5)

 

Answer 2

$(x-5)^2+ (x-5)(x+5)=x^2-10x+25+x^2-25=2x^2-10x$

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