Answers

2016-02-20T21:50:03+05:30
r²/s²-81/100=0
r²/s²=81/100
r/s=√81/100
r/s=9/10
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2016-02-20T21:54:14+05:30
= r²/s²-(9)²/(10)²
= (r/s)²-(9/10)²
= (r/s+9/10)(r/s-9/10)
Or
= (10r+9s)(10r-9s)/(100s²)
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