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Popular >

expand (2k+1)^4

Solution

expand

(2 k + 1)^{4}

Solution

16 k^{4} + 32 k^{3} + 24 k^{2} + 8 k + 1

Solution steps

(2 k + 1)^{4}

Apply binomial theorem:

(a + b)^{n} = i = 0 \sum n (i n) a^{(n - i)} b^{i}

a = 2 k, b = 1

= i = 0 \sum 4 (i 4) (2 k)^{(4 - i)} \cdot 1^{i}

Expand summation

= \frac{4 !}{0 ! ( 4 - 0 ) !} (2 k)^{4} \cdot 1^{0} + \frac{4 !}{1 ! ( 4 - 1 ) !} (2 k)^{3} \cdot 1^{1} + \frac{4 !}{2 ! ( 4 - 2 ) !} (2 k)^{2} \cdot 1^{2} + \frac{4 !}{3 ! ( 4 - 3 ) !} (2 k)^{1} \cdot 1^{3} + \frac{4 !}{4 ! ( 4 - 4 ) !} (2 k)^{0} \cdot 1^{4}

Simplify

\frac{4 !}{0 ! ( 4 - 0 ) !} (2 k)^{4} \cdot 1^{0} : 16 k^{4}

Simplify

\frac{4 !}{1 ! ( 4 - 1 ) !} (2 k)^{3} \cdot 1^{1} : 32 k^{3}

Simplify

\frac{4 !}{2 ! ( 4 - 2 ) !} (2 k)^{2} \cdot 1^{2} : 24 k^{2}

Simplify

\frac{4 !}{3 ! ( 4 - 3 ) !} (2 k)^{1} \cdot 1^{3} : 8 k

Simplify

\frac{4 !}{4 ! ( 4 - 4 ) !} (2 k)^{0} \cdot 1^{4} : 1

= 16 k^{4} + 32 k^{3} + 24 k^{2} + 8 k + 1

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Frequently Asked Questions (FAQ)

What is expand (2k+1)^4 ?
The solution to expand (2k+1)^4 is 16k^4+32k^3+24k^2+8k+1