Question 54

The coefficient of y in the expansion of $$(2y - 5)^3$$, is:

Solution

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$$(2y - 5)^3$$

= $$8y^3 - 125 +150y - 60y^2$$  

$$(\because(a-b)^3 = a^3 - b^3 - 3a^2b + 3ab^2)$$

The coefficient of y = 150

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