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Answer 1

Answer:

$(\frac{2}{5}x + \frac{3}{7}y )( \frac{2}{5} x + \frac{3}{7} y)$

$= {( \frac{2}{5}x + \frac{3}{7} y)}^{2}</p><p>{(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2}$

${( \frac{2}{5}x + \frac{3}{7} y)}^{2}$

$= {( \frac{2}{5} x)}^{2} + 2 (\frac{2}{5} x)$

$( \frac{3}{7} y) + {( \frac{3}{7} y)}^{2}$

$= \frac{4}{25} {x}^{2} + \frac{12}{35} xy + \frac{9}{49} {y}^{2}$