Find the coefficient of X3 in the expansion of (1 + x) 2 (1-x) 5

(1 + x) ^ 2 (1-x) ^ 5 is a bit like a combination. For example, if x ^ 2 is taken from (1 + x) ^ 2, then One-X and four ones will be taken from (1-x) ^ 5, that is, x ^ 2. (- x). 1.1.1 = - x ^ 3
(1+x)^2：1、x、x^2
(1-x) ^ 5: - x ^ 3, (- x) ^ 2, - x the final answer is - 1

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