Question

(2/3x+5/7y)² plz tell fast by writing...like why is the answer coming 20/21xyI'll mark u brainliest​

Answer 1

Step-by-step explanation:

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

$\frac{4}{9} {x}^{2} + \frac{20}{21} xy + \frac{25}{49} {y}^{2}$