Math Is Fun Forum

sologuitar

Member

Registered: 2022-09-19

Posts: 467

Complex Numbers

Write the expression in the standard form a + bi.

6i^3 + 4i^5

6(-i) + 4(i)

-6i + 4i

My answer = -2i

Textbook answer = -10i

Why is my answer wrong?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,169

Re: Complex Numbers

I like your answer.

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

amnkb

Member

Registered: 2023-09-19

Posts: 253

Re: Complex Numbers

Write the expression in the standard form a + bi.

6i^3 + 4i^5

sologuitar

Member

Registered: 2022-09-19

Posts: 467

Re: Complex Numbers

I like your answer.

Bob

Thanks. It must be a textbook typo. Math and physics books are famous for having lots of computational errors.

sologuitar

Member

Registered: 2022-09-19

Posts: 467

Re: Complex Numbers

Write the expression in the standard form a + bi.

6i^3 + 4i^5

Sure feels good to be right. Like I told Bob, math and physics books are famous for having computational errors.