factorize
ax2+bx2+cx2....zx2
challenge for uh............
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ax²+bx²+cx²+......+zx²
=x²(a+b+c+....+z)
=x²(n/2(2a+(n-1)d) [Sn in ap]
=x²(26/2(2a+(26-1)(b-a))
=x²(13(2a+25b-25a)
=x²(13(25b-23a))
=x²(325b-299a)
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