Factorise :
2a3 - 50a
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= 2a(a2 - 25)
= 2a(a2 - 52)
Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= 2a(a - 5)(a + 5)
Hence,2a3 - 50a = 2a(a - 5)(a + 5)
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