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What is the value of (1 + i)^2?

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Question: What is the value of (1 + i)^2?

Options:

  1. 2i
  2. 2
  3. 0
  4. 1 + 2i

Correct Answer: 2i

Solution: 

(1 + i)^2 = 1^2 + 2*1*i + i^2 = 1 + 2i - 1 = 2i.

What is the value of (1 + i)^2?

Practice Questions

Q1
What is the value of (1 + i)^2?
  1. 2i
  2. 2
  3. 0
  4. 1 + 2i

Questions & Step-by-Step Solutions

What is the value of (1 + i)^2?
Correct Answer: 2i
  • Step 1: Start with the expression (1 + i)^2.
  • Step 2: Use the formula for squaring a binomial: (a + b)^2 = a^2 + 2ab + b^2.
  • Step 3: In our case, a = 1 and b = i. So, we apply the formula: (1 + i)^2 = 1^2 + 2*1*i + i^2.
  • Step 4: Calculate 1^2, which is 1.
  • Step 5: Calculate 2*1*i, which is 2i.
  • Step 6: Calculate i^2. Remember that i is the imaginary unit, and i^2 = -1.
  • Step 7: Now, combine all the parts: 1 + 2i + (-1).
  • Step 8: Simplify the expression: 1 - 1 + 2i = 0 + 2i.
  • Step 9: The final result is 2i.
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