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3.4.1 Sequences and Series (A-level only)

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Question 17

Expand $(25+2x)12\displaystyle (25 + 2x)^{\frac{1}{2}}$ in ascending powers of $x\,$ up to and including the term in $x^3$ .

[4]

Write down the range of values of $x\,$ for which the expansion is valid.

[1]

Use your expansion, with a suitable value of $x$ , to find the value of $\sqrt{25.2}\,$ correct to 5 significant figures.

[2]

Markscheme

3.4.1 Sequences and Series (A-level only) Questions

A Level
Maths
3.4.1 Sequences and Series (A-level only)

43 exam-style questions on WJEC A Level Maths 3.4.1 Sequences and Series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

3.4.1 Sequences and Series (A-level only)

Question bank

3.4.1 Sequences and Series (A-level only)

Easy Medium

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Question 17

Expand $(25+2x)12\displaystyle (25 + 2x)^{\frac{1}{2}}$ in ascending powers of $x\,$ up to and including the term in $x^3$ .

[4]

Write down the range of values of $x\,$ for which the expansion is valid.

[1]

Use your expansion, with a suitable value of $x$ , to find the value of $\sqrt{25.2}\,$ correct to 5 significant figures.

[2]

Markscheme

3.4.1 Sequences and Series (A-level only) Questions

A Level
Maths
3.4.1 Sequences and Series (A-level only)

43 exam-style questions on WJEC A Level Maths 3.4.1 Sequences and Series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.