Question

$81x ^{4} - 256y ^{4}$
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Answer 1

81x*4 - 256y*4

9x²- 16y²......taking square root.

3x- 4y .........taking square root.

3x=4y

$\frac{x}{y} = \frac{4}{3}$

hence, x=4 and y=3

hope this helps you. :-)