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(X-3)^2-x(x-5)=..ajutor


Răspuns :

(x-3)^2= x^2 - 2 · x · 3 + 3^2= x^2 - 6x + 9

x^2 - 6x + 9 - x 
· x + x · 5 =
x^2 - 6x + 9 - x^2 + 5x = (x^2 si -x^2 se reduc)
-6x + 9 + 5x= (-6x + 5x = x)
x + 9