Write the first three terms of the expansion of (2x-y)^7?

Question

Write the first three terms of the expansion of (2x-y)^7?

Answer 1

(2x - y)^7 = 128x^7 - 448x^6y + 672x^5y^2 - 560x^4y^3 + 280x^3y^4 - 84x^2y^5 + 14xy^6 - y^7

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