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    Hello, I am having trouble obtaining an answer for this question. All help is appreciated I have already acquired all the correct working out through my own endeavour but I am struggling to obtain the solution.

     (x + 2y)^3 = 2^{30} 

x + 2y = 2^{10}

    The answer being:
     2^9 - 1

    Can someone also please explain what the question means by "the number of pairs of positive integers"Name:  IMG_3085.PNG
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    Thanks again, please help if possible
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Updated: October 17, 2015
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