if 9xsquare+25ysquare=181 and xy=-6, find the value of 3xsquare+5y
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9x^2 + 25y^2 = 181
where xy = -6
3x^2 + 5y = ?
(x+y)^2 = x^2+y^2 + 2xy
3x^2 + 5y = (x^2 + y^2) + 2×(-6)
now solve it
where xy = -6
3x^2 + 5y = ?
(x+y)^2 = x^2+y^2 + 2xy
3x^2 + 5y = (x^2 + y^2) + 2×(-6)
now solve it
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