1. a+b+c=9 and ab+bc+ca =26 find a²+b²+c². 2. if 2x +3y=12 and xy=6 find the value of 8x³+27y³.
3. factorise (a+b)³-(a-b)³.
4. if a+b+c =5 and ab+bc+ca =10 then prove that a³+b³+c³-3abc=-25

Plzzcan somone solve these question its urgent

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

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