Complex Numbers Review

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What is a complex number?

Back

A complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is the imaginary unit, defined as the square root of -1.

Front

What is the imaginary unit 'i'?

Back

The imaginary unit 'i' is defined as i = √(-1). It is used to represent the square root of negative numbers.

Front

What is the standard form of a complex number?

Back

The standard form of a complex number is a + bi, where a is the real part and b is the imaginary part.

Front

How do you add complex numbers?

Back

To add complex numbers, combine their real parts and their imaginary parts separately. For example, (a + bi) + (c + di) = (a + c) + (b + d)i.

Front

How do you subtract complex numbers?

Back

To subtract complex numbers, subtract their real parts and their imaginary parts separately. For example, (a + bi) - (c + di) = (a - c) + (b - d)i.

Front

What is the product of two complex numbers (a + bi)(c + di)?

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The product is given by (ac - bd) + (ad + bc)i.

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What is the value of i^2?

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i^2 = -1.

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How do you multiply a complex number by a real number?

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To multiply a complex number by a real number, multiply both the real and imaginary parts by that number. For example, k(a + bi) = ka + kbi.

Front

What is the conjugate of a complex number a + bi?

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The conjugate of a complex number a + bi is a - bi.

Front

How do you divide complex numbers?

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To divide complex numbers, multiply the numerator and denominator by the conjugate of the denominator and simplify.