if x= 5+√5 find the value of 10x+7x^2-x^3
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5
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60
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10x+7x^2-x^3
(10+7x-x^2)(-x)
{10+7(5+√5)-(5+√5)^2}{-(5+√5)}. since x =(5+√5)
{10+35+7√5-25-5-10√5}{-(5+√5)}
(15-3√5){-(5+√5)}
(5-√5)(-3)(5+√5)
(25-5)(-3)
-60.
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