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Popular >

simplify (-2-3i)^4

Solution

simplify

(- 2 - 3 i)^{4}

Solution

- 119 - 120 i

Solution steps

(- 2 - 3 i)^{4}

Apply binomial theorem:

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

a = - 2, b = - 3 i

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

Expand summation

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

Simplify

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

Simplify

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

Simplify

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

Simplify

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

Simplify

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

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

Simplify

16 + 96 i + 216 i^{2} + 216 i^{3} + 81 i^{4} : - 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 (-2-3i)^4 ?
The solution to (-2-3i)^4 is -119-120i