Asked by Luis
A student incorrectly claims that the factored form of the expression 4x2+5is (4x+5i)(4x−5i).
a. Describe the error that the student made.
b. How could the student have determined that his or her answer is incorrect?
c. What is the correct factored form of the expression?
a. Describe the error that the student made.
b. How could the student have determined that his or her answer is incorrect?
c. What is the correct factored form of the expression?
Answers
Answered by
oobleck
4x^2+5 = (2x)^2 - (√5 i)^2
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