👤

(2x – 5)2 +3(x − 2)(x+2) - (x+4)2 ,


Răspuns :

4x^2-20x+25+3(x^2-4)-(x^2+8x+16)

4x^2-20x+25+3x^2-12-x^2-8x-16

6x^2-28x-3