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A number x is multiplied with itself and then added to the product of 4 and x. If the result of these two operations is -4, what is the value of x?
  • a)
    -4
  • b)
    -2
  • c)
    2
  • d)
    4
  • e)
    Cannot be determined.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A number x is multiplied with itself and then added to the product of ...
Given
  • x∗x+4∗x=−4
  • x2 + 4x + 4 = 0
To Find: value of x?
Approach
  1. As we have a quadratic equation x2+4x+4=0
  1. , we will solve this equation to find out the value of x
Working Out
x2+4x+4=0
⇒(x+2)2=0
⇒x=−2
Answer: B
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