If $$x - y = 4$$ and $$xy = 45$$, then the value of $$x^3 - y^3$$ is:
x - y = 4
xy = 45
$$x^3 - y^3$$
= $$(x - y)^3 + 3xy(x - y)$$
=Â $$(4)^3 + 3\times 45(4)$$
= 64 + 540 = 604
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