if 9x²+25y²=181 and xy= -6 than find 3x+5y
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using identity (a+b)²=a²+2ab+b²
(3x+5y)²=(3x)²+2×(3x)×(5y)+(5y)²
=9x²+(-96)+25y²
=9x²+25y²-96
=181-96
=85
3x+5y=√85=9.21
(3x+5y)²=(3x)²+2×(3x)×(5y)+(5y)²
=9x²+(-96)+25y²
=9x²+25y²-96
=181-96
=85
3x+5y=√85=9.21
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