What is the formula of (x^3 + y^3) as a factorized form?

Which value is not a solution of 8x^3 – 1 = 0

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Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment