Question

.............................va rog

Answer 1

Folosim formula:  $(a\pm{b})^2=a^2\pm2\cdot{a}\cdot{b}+b^2$
$a)\;\;\;(x+2)^2=x^2+2*x*2+2^2=x^2+4x+4;\\ b)\;\;\;(2+x)^2= .... =4+4x+x^2;\\ c)\;\;\;(3x+1)^2=...=9x^26x+1;$