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Popular >

simplify (1-3i)^7

Solution

simplify

(1 - 3 i)^{7}

Solution

- 2456 - 1992 i

Solution steps

(1 - 3 i)^{7}

Apply binomial theorem:

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

a = 1, b = - 3 i

= i = 0 \sum 7 (i 7) \cdot 1^{(7 - i)} (- 3 i)^{i}

Expand summation

= \frac{7 !}{0 ! ( 7 - 0 ) !} \cdot 1^{7} (- 3 i)^{0} + \frac{7 !}{1 ! ( 7 - 1 ) !} \cdot 1^{6} (- 3 i)^{1} + \frac{7 !}{2 ! ( 7 - 2 ) !} \cdot 1^{5} (- 3 i)^{2} + \frac{7 !}{3 ! ( 7 - 3 ) !} \cdot 1^{4} (- 3 i)^{3} + \frac{7 !}{4 ! ( 7 - 4 ) !} \cdot 1^{3} (- 3 i)^{4} + \frac{7 !}{5 ! ( 7 - 5 ) !} \cdot 1^{2} (- 3 i)^{5} + \frac{7 !}{6 ! ( 7 - 6 ) !} \cdot 1^{1} (- 3 i)^{6} + \frac{7 !}{7 ! ( 7 - 7 ) !} \cdot 1^{0} (- 3 i)^{7}

Simplify

\frac{7 !}{0 ! ( 7 - 0 ) !} \cdot 1^{7} (- 3 i)^{0} : 1

Simplify

\frac{7 !}{1 ! ( 7 - 1 ) !} \cdot 1^{6} (- 3 i)^{1} : - 21 i

Simplify

\frac{7 !}{2 ! ( 7 - 2 ) !} \cdot 1^{5} (- 3 i)^{2} : 189 i^{2}

Simplify

\frac{7 !}{3 ! ( 7 - 3 ) !} \cdot 1^{4} (- 3 i)^{3} : - 945 i^{3}

Simplify

\frac{7 !}{4 ! ( 7 - 4 ) !} \cdot 1^{3} (- 3 i)^{4} : 2835 i^{4}

Simplify

\frac{7 !}{5 ! ( 7 - 5 ) !} \cdot 1^{2} (- 3 i)^{5} : - 5103 i^{5}

Simplify

\frac{7 !}{6 ! ( 7 - 6 ) !} \cdot 1^{1} (- 3 i)^{6} : 5103 i^{6}

Simplify

\frac{7 !}{7 ! ( 7 - 7 ) !} \cdot 1^{0} (- 3 i)^{7} : - 2187 i^{7}

= 1 - 21 i + 189 i^{2} - 945 i^{3} + 2835 i^{4} - 5103 i^{5} + 5103 i^{6} - 2187 i^{7}

Simplify

1 - 21 i + 189 i^{2} - 945 i^{3} + 2835 i^{4} - 5103 i^{5} + 5103 i^{6} - 2187 i^{7} : - 1992 i - 2456

= - 1992 i - 2456

Rewrite in standard complex form:

- 2456 - 1992 i

= - 2456 - 1992 i

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Frequently Asked Questions (FAQ)

What is (1-3i)^7 ?
The solution to (1-3i)^7 is -2456-1992i