Question

help help help help ​

Answer 1

Answer:

I think the answer is d but I'm not sure. can you tell the answer in comment

Answer 2

${[ \frac{4}{5}a + \frac{5}{4} b ] }^{2} \\ \\ now \: we \: know \: that \: \: {(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2} \\ \\ so \: \: as \: per \: above \\ \\ {[ \frac{4}{5}a + \frac{5}{4} b ] }^{2} \\ \\ = {( \frac{4}{5} a)}^{2} + 2( \frac{4}{5} a)( \frac{5}{4} b) + {( \frac{5}{4} b)}^{2} \\ \\ = \frac{16}{25} {a}^{2} + 2( \frac{20}{20} ab) + \frac{25}{16} {b}^{2} \\ \\ = \frac{16}{25} {a}^{2} + 2( (1) ab) + \frac{25}{16} {b}^{2} \\ \\ \frac{16}{25} {a}^{2} + 2( ab) + \frac{25}{16} {b}^{2} \\ \\ = \frac{16}{25} {a}^{2} + 2ab + \frac{25}{16} {b}^{2}$

here option A is match with answer

so answer is

option - A

hope it helps...

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