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Popular >

simplify (2i+3)^4

Solution

simplify

(2 i + 3)^{4}

Solution

- 119 + 120 i

Solution steps

(2 i + 3)^{4}

Apply binomial theorem:

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

a = 2 i, b = 3

= i = 0 \sum 4 (i 4) (2 i)^{(4 - i)} \cdot 3^{i}

Expand summation

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

Simplify

\frac{4 !}{0 ! ( 4 - 0 ) !} (2 i)^{4} \cdot 3^{0} : 16 i^{4}

Simplify

\frac{4 !}{1 ! ( 4 - 1 ) !} (2 i)^{3} \cdot 3^{1} : 96 i^{3}

Simplify

\frac{4 !}{2 ! ( 4 - 2 ) !} (2 i)^{2} \cdot 3^{2} : 216 i^{2}

Simplify

\frac{4 !}{3 ! ( 4 - 3 ) !} (2 i)^{1} \cdot 3^{3} : 216 i

Simplify

\frac{4 !}{4 ! ( 4 - 4 ) !} (2 i)^{0} \cdot 3^{4} : 81

= 16 i^{4} + 96 i^{3} + 216 i^{2} + 216 i + 81

Simplify

16 i^{4} + 96 i^{3} + 216 i^{2} + 216 i + 81 : 120 i - 119

= 120 i - 119

Rewrite in standard complex form:

- 119 + 120 i

= - 119 + 120 i

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Frequently Asked Questions (FAQ)

What is (2i+3)^4 ?
The solution to (2i+3)^4 is -119+120i