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  1. J

    Powers of sums/Fractional exponents

    for your first problem, as it stands (x + 5)3 = 3x + 15 but i think you meant to say (x+5)^3 you can do this by applying the following twice (a+b)^2=a^2+2ab+b^2 (a+b)^3=a^3+3a^2b+3ab^2+b^3 so (x+5)^3=x^3+15x^2+75x+125
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