(0,7x + 1,4y)2 = (0,7x + 1,4y)(0,7x + 1,4y)
= 0,7x0,7x + 0,7x1,4y + 1,4y0,7x + 1,4y1,4y
= 0,49x^2 + 0,98xy + 0,98xy + 1,96y^2
= 0,49x^2 + 1,96xy + 1,96y^2