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Popular >

simplify (7+2i)^4

Solution

simplify

(7 + 2 i)^{4}

Solution

1241 + 2520 i

Solution steps

(7 + 2 i)^{4}

Apply binomial theorem:

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

a = 7, b = 2 i

= i = 0 \sum 4 (i 4) \cdot 7^{(4 - i)} (2 i)^{i}

Expand summation

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

Simplify

\frac{4 !}{0 ! ( 4 - 0 ) !} \cdot 7^{4} (2 i)^{0} : 2401

Simplify

\frac{4 !}{1 ! ( 4 - 1 ) !} \cdot 7^{3} (2 i)^{1} : 2744 i

Simplify

\frac{4 !}{2 ! ( 4 - 2 ) !} \cdot 7^{2} (2 i)^{2} : 1176 i^{2}

Simplify

\frac{4 !}{3 ! ( 4 - 3 ) !} \cdot 7^{1} (2 i)^{3} : 224 i^{3}

Simplify

\frac{4 !}{4 ! ( 4 - 4 ) !} \cdot 7^{0} (2 i)^{4} : 16 i^{4}

= 2401 + 2744 i + 1176 i^{2} + 224 i^{3} + 16 i^{4}

Simplify

2401 + 2744 i + 1176 i^{2} + 224 i^{3} + 16 i^{4} : 2520 i + 1241

= 2520 i + 1241

Rewrite in standard complex form:

1241 + 2520 i

= 1241 + 2520 i

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Frequently Asked Questions (FAQ)

What is (7+2i)^4 ?
The solution to (7+2i)^4 is 1241+2520i