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Binomial expansion with 2 brackets?? Help! watch

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    Community Assistant
    (Original post by Jones3211)
    I’m doing AS level maths with AQA and this question is in my text book but I have no idea how to do it, please help!
    The question is...
    Find the coefficient of x^4 in the expansion of (1+x)(2x-3)^5
    I have no idea how to begin, the answer is in the back of the book but it doesn’t lead me to how to get it, just displays the final answer.
    Any help is appreciated!

    Get the expansion for (2x-3)^5 up to x^4. Then replace the first term by the x^4 term of the expansion, and replace the second term by x \times ( x^3 \ \text{term of the expansion})
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