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If a ,b ,c are in A.P., then prove that...

If `a ,b ,c` are in A.P., then prove that: `(a-c)^2=4(b^2-a c)`, `a^3+4b^3+c^3=3b(a^2+c^2)`

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Since a,b,c be in A.P,
So `2b = a+c`
`b = (a+c)/2`
`(a-c)2/(b2-ac) = (a-c)2/((a+c)2/4)-ac)`
...
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