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4.2 Expanding (a + bx)^n

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Question 66

Find the first three terms, in ascending powers of $x$ , in the expansion of

3 + kx)^6

where $k$ is a positive constant.

[3]

Hence, given that the coefficient of $x^2$ is six times the coefficient of $x$ , find the value of $k$ .

[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 66

Find the first three terms, in ascending powers of $x$ , in the expansion of

3 + kx)^6

where $k$ is a positive constant.

[3]

Hence, given that the coefficient of $x^2$ is six times the coefficient of $x$ , find the value of $k$ .

[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.