Question

X квадрат + 2 XY + y квадрат

Answer 1

$x^2+2xy+y^2=(x+y)^2$

Answer 2

используя ->> a^2+2ab+b^2=(a+b)^2

${x}^{2} + 2xy + {y}^{2} = (x + y) {}^{2}$