2a^3 + 54 can first be factored into 2 (a^3 + 27). This can then be factored out to 2 (a + 3) (a^2 - 3a + 9).
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54 cubed = 54 x 54 x 54 =157464 and hence square root of 157464 is 396.817
3.7797631496846194943016318218347
625 * * * * * Actually, that is 54. 5 cubed, or 53 = 125
(x-6)(x-9) I did that by factoring 54 until I found two numbers that added up to 15.
Find the reciprocal: 9/10