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Answer=-7(1+80√3)
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ANSWER
-7(1+80√3)
Step By Step Explanation
We have >
x =
Now on multiplying by In both numerator and denominator we get =>
x =
{By using a² - b² = (a+b)(a-b)}
=> x =
=> x =
Now, again we have >
y =
So, on multiplying by on both numerator and denominator we get >
=>y =
{By using a² - b² = (a+b)(a-b)}
=> y =
=> Y =
Now the given equation we have is
=>5x² - 7xy - 5y²
=>5(7-4√3)² - 7(7-4√3)(7+4√3) - 5(7+4√3)²
=> 5(49 + 48 - 56√3) -7(1) - 5(49 + 48 + 56√3)
=> 245 + 240 - 280√3 -7 - 245 - 240 - 280√3
=> -280√3 - 280√3 - 7
=> -560√3 - 7
=> -7(80√3 +1)
Remember
1)a² - b² = (a+b)(a-b)
2) (a+b)² = a² + b² + 2ab
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