Evaluation of expressions

If a2-3a+1=0, find

(ii) a3+1/a3

Correct answer:

x1 =  7
x2 =  7
y1 =  18
y2 =  18

Step-by-step explanation:

a23a+1=0  a23a+1=0 a23a+1=0  p=1;q=3;r=1 D=q24pr=32411=5 D>0  a1,2=2pq±D=23±5 a1,2=1.5±1.1180339887499 a1=2.6180339887499 a2=0.38196601125011   Factored form of the equation:  (a2.6180339887499)(a0.38196601125011)=0 x1=a12+1/a12=2.6182+1/2.6182=7

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