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Popular >

simplify (4-7i)^4

Solution

simplify

(4 - 7 i)^{4}

Solution

- 2047 + 3696 i

Solution steps

(4 - 7 i)^{4}

Apply binomial theorem:

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

a = 4, b = - 7 i

= i = 0 \sum 4 (i 4) \cdot 4^{(4 - i)} (- 7 i)^{i}

Expand summation

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

Simplify

\frac{4 !}{0 ! ( 4 - 0 ) !} \cdot 4^{4} (- 7 i)^{0} : 256

Simplify

\frac{4 !}{1 ! ( 4 - 1 ) !} \cdot 4^{3} (- 7 i)^{1} : - 1792 i

Simplify

\frac{4 !}{2 ! ( 4 - 2 ) !} \cdot 4^{2} (- 7 i)^{2} : 4704 i^{2}

Simplify

\frac{4 !}{3 ! ( 4 - 3 ) !} \cdot 4^{1} (- 7 i)^{3} : - 5488 i^{3}

Simplify

\frac{4 !}{4 ! ( 4 - 4 ) !} \cdot 4^{0} (- 7 i)^{4} : 2401 i^{4}

= 256 - 1792 i + 4704 i^{2} - 5488 i^{3} + 2401 i^{4}

Simplify

256 - 1792 i + 4704 i^{2} - 5488 i^{3} + 2401 i^{4} : 3696 i - 2047

= 3696 i - 2047

Rewrite in standard complex form:

- 2047 + 3696 i

= - 2047 + 3696 i

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Frequently Asked Questions (FAQ)

What is (4-7i)^4 ?
The solution to (4-7i)^4 is -2047+3696i