Question

expand (4/5 x+ 5/4y)^2​

Answer 1

Answer:

${( \frac{4x}{5} + \frac{5y}{4} ) }^{2} \\ = {( \frac{4x}{5} )}^{2} + {( \frac{5y}{4}) }^{2} + 2 \times \frac{4x }{5} \times \frac{5y}{4} \\ = \frac{ {16x}^{2} }{25} + \frac{ {25y}^{2} }{16} + 2xy$

Answer 2

(4/5x+5/4y)²

{(a+b)²=a²+b²+2ab}

(4/5x)²+(5/4y)²+2×4/5x×5/4y

16/25x²+25/16y²+40/20xy

16/25x²+25/16y²+2xy

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