If x+y =8 and xy=15 then …
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... Kumari 4 years, 1 month ago
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Yogita Ingle 4 years, 1 month ago
x + y = 8
xy = 15.
{tex}( x+y )^2 = x^2 + y^2 + 2xy{/tex}
{tex}x^2 + y^2 = ( x + y )^2 - 2xy{/tex}
{tex}= 8^2 - 2×15{/tex}
= 64 - 30
{tex}x^2 + y^2 = 34.{/tex}
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