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7) Use Pascal's Triangle to find the coefficients for (a + b)5 .

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    5c0a^5 + 5c1a^4b + 5c2 a^3 b^2 + 5c3 a^2b^3 + 5c4ab^4 + 5c5b^5

    5c0= 1= 5c5. . 5c1= 5 = 5c4 5c2= 10
    5c3= 10
    Plugging in these values,
    a^5+ 5a^4b+ 10a^3b^2 + 10a^2b^3 + 5ab^4 + b^5

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