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Easy

Question

How many solutions does the equation x left parenthesis x minus 4 right parenthesis equals left parenthesis x minus 1 right parenthesis left parenthesis x plus 1 right parenthesis have?

  1. Zero
  2. One
  3. Two
  4. More than two

The correct answer is: One


    given, x left parenthesis x minus 4 right parenthesis equals left parenthesis x minus 1 right parenthesis left parenthesis x plus 1 right parenthesis
    we know that left parenthesis x minus a right parenthesis left parenthesis x plus a right parenthesis equals x squared minus a squared, here we get a = 1
    So, x squared minus 4 x equals x squared minus 1 not stretchy rightwards double arrow negative 4 x equals 1
    therefore straight x equals negative 1 fourth so, we have only one solution for given equation.

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