Tutorial - Simplifying an expression by rewriting it with the imaginary unit i ex 10, 3 + 2 root(-4)

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Mathematics
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11th Grade - University
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Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the imaginary unit 'i' defined as?
The square root of 1
The square root of -1
The square root of 0
The square root of 2
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why can't we take the square root of -4 under the real number system?
Because -4 is not a perfect square
Because -4 is an imaginary number
Because the square root of a negative number is not defined in the real number system
Because the square root of -4 is a complex number
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the expression 3 + 2 times sqrt(-4) rewritten using imaginary numbers?
3 + 2 times i
3 + 2 times sqrt(4) * i
3 + 2 times sqrt(-1) * 4
3 + 2 times 4 * i
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the value of sqrt(4) in the expression?
2
4
3
1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the final simplified form of the expression 3 + 2 * 2 * i?
3 + 6i
3 + 8i
3 + 4i
3 + 2i
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