If x equal 5+root 5,find the value of 10x+7xsquare-xsquare
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Step-by-step explanation:
Given, x = 5 + root 5
so 10x + 7xsquare - xsquare
= 10x + 6xsquare = 2x( 5 + 3x)
= (10 + 2 root 5)(5+ 15 + 3root 5) (putting the value of x )
= (10 + 2 root 5)(20 + 3 root 5)
= 200 + 40 root 5 + 30 root 5 + 6(5)
= 200 + 70 root 5 + 30
= 230 + 70 root 5
= 10 (23 + 7 root 5)
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