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4.2 Expanding (a + bx)^n

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Question 64

One of the terms in the binomial expansion of $2 + bx)^5$ , where $b\,$ is a constant, is $720x^2$ .

Find the possible values of $b$ .

[3]

Hence find the term independent of $x\,$ in the expansion of

\left( \frac{1}{4} + \frac{1}{x^5} \right) (2 + bx)^5

[3]

Markscheme

4.2 Expanding (a + bx)^n Questions

A Level
Maths
4.2 Expanding (a + bx)^n

99 exam-style questions on Edexcel A Level Maths 4.2 Expanding (a + bx)^n. Each one has a worked solution and a mark scheme showing where the marks go.

4.2 Expanding (a + bx)^n

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4.2 Expanding (a + bx)^n

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Question 64

One of the terms in the binomial expansion of $2 + bx)^5$ , where $b\,$ is a constant, is $720x^2$ .

Find the possible values of $b$ .

[3]

Hence find the term independent of $x\,$ in the expansion of

\left( \frac{1}{4} + \frac{1}{x^5} \right) (2 + bx)^5

[3]

Markscheme

4.2 Expanding (a + bx)^n Questions

A Level
Maths
4.2 Expanding (a + bx)^n

99 exam-style questions on Edexcel A Level Maths 4.2 Expanding (a + bx)^n. Each one has a worked solution and a mark scheme showing where the marks go.