In the given figure find the measure angle x^°#class 8 r s agrawal ex 14 A#class 8 polygon

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In the given figure find the measure angle x^°#class 8 r s agrawal ex 14 A#class 8 polygon
#r s agrawal ex 14A
#polygon important question
#polygon
#class 8
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If x = (5 -√21)
prove that
2
( x³+1/x³)-5( x+1/x²)+( x+1/x)=0.
Sir, please explain this question 🙏🏻

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