จำนวนเชิงซ้อน

What is (3 + 4i) + (1 + 2i)?

• 5 + 5i

• 2 + 3i

• 4 + 6i

• 3 + 4i

Calculate (5 + 6i) - (2 + 3i).

• 3 + 3i

• 2 + 3i

• 1 + 2i

• 7 + 9i

What is (2 + 3i) * (4 + 5i)?

• 8 + 7i

• -1 + 10i

• -7 + 22i

• 6 + 15i

Find the result of (6 + 2i) / (3 + 1i).

• 2.5

• 4.0

• 8.0

• 1.6

Express the complex number 3 + 4i in polar form.

• 5(cos(4/3) + i sin(4/3))

• 5(cos(arctan(4/3)) + i sin(arctan(4/3)))

• 7(cos(arctan(3/4)) + i sin(arctan(3/4)))

• 4(cos(3/4) + i sin(3/4))

What is the sum of (1 + 2i) and (3 + 4i)?

• 5 + 4i

• 1 + 2i

• 2 + 3i

• 4 + 6i

Calculate the difference (7 + 8i) - (5 + 6i).

• 1 + 2i

• 2 + 2i

• 0 + 1i

• 3 + 4i

What is the product of (1 - i) and (2 + 3i)?

• 5 + i

• 6 - i

• -1 + 4i

• 3 + 2i

Find the quotient of (4 + 2i) / (2 - i).

• 1 + 2i

• 1.2 + 1.6i

• 3 - i

• 2 + 3i

Express the complex number 5 - 3i in rectangular form.

• -5 + 3i

• 5 + 3i

• 3 + 5i

• 5 - 3i