Question

x-y=3,xy=28 হলেX+Y এর মান কত

Answer 1

${x - y}^{2} = {x}^{2} + {y}^{2} - 2xy \\ {3}^{2} = {x}^{2} + {y}^{2} - 56 \\ {(x + y)}^{2} = 56 + 9 \\ x + y = \sqrt{65}$