Răspuns: [tex]\bf 2x^{2} +3x + 9[/tex]
Explicație pas cu pas:
[tex]\bf \big(x-3\big)^{2}+x\cdot \big(x+9\big ) =[/tex]
[tex]\bf \ x^{2} - 6x + 9 +x\cdot \big(x+9\big ) =[/tex]
[tex]\bf \ x^{2} - 6x + 9 +x^{2} +9x =\red{\underline{ 2x^{2} +3x + 9}}[/tex]
