Question

(x+3) elevado a 2 + 2x elevado a 2 -6x

Answer 1

$(x + 3) {}^{2} + 2x {}^{2} - 6x \\ (x) {}^{2} + 2.x.3 + (3) {}^{2} + 2x {}^{2} - 6x \\ x {}^{2} + 5x + 9 + 2x {}^{2} - 6x \\ x {}^{2} - x + 9 + 2x {}^{2} \\ 3x {}^{2} - x + 9$