Question

If p²-3p-1=0,find (iii)p³-1/p³

Answer 1

explanation:

² - 3p + 1 = 0

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• We have to find the value of p² +  

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Solution:

p² - 3p + 1 = 0

p² + 1 = 3p

Divide by p on both sides

+  =  

p +  = 3

Now.. squaring on both sides..

= (3)²

• (a + b)² = a² + b² + 2ab

= 9

p² + 1/p^2 + 2 = 9

p² + 1/p^2  = 7

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