Question

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Answer 1

Answer:  $\frac{49}{64}x^{2} +\frac{16}{25} y^{2} +\frac{7}{5}xy$

Step-by-step explanation:

using the formula : $(a+b)^{2} =a^{2} +b^{2} +2ab$

$(\frac{7}{8}x +\frac{4}{5}y )^{2} \\\\\frac{49}{64}x^{2} +\frac{16}{25} y^{2} +2(\frac{7}{8}x)(\frac{4}{5}y)\\\\ \frac{49}{64}x^{2} +\frac{16}{25} y^{2} +\frac{7}{5}xy$

Answer 2

Answer:

$\frac{49}{64} x {}^{2} + \frac{16}{25} y {}^{2} + \frac{7}{5} xy$

Step-by-step explanation:

using (a+b)²