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If 9x^2+25 y^2=181 and x y=-6, find the ...

If `9x^2+25 y^2=181` and `x y=-6,` find the value of `3x+5y`

Text Solution

Verified by Experts

As we know that `(a+b) ^2 =a^2 +b^2 +2ab`
`=>(3x+5y)^2 =9x ^2 +25y^2 +2*3x*5y`
`=>181−180`
`=>1`
`=>(3x+5y)=sqrt 1`
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