Mathematics
Grade10
Easy

Question

Find the solution of the quadratic equation 8 straight x squared minus 6 straight x minus 5 equals 0.

  1. straight x equals 5 over 4 comma space straight x equals negative 1 half
  2. straight x equals 3 over 4 comma space straight x equals negative 1 half
  3. straight x equals 2 over 4 comma space straight x equals negative 1 half
  4. straight x equals 5 over 4 comma space straight x equals 1 half

The correct answer is: straight x equals 5 over 4 comma space straight x equals negative 1 half


    8 straight x squared minus 6 straight x minus 5 equals 0
8 straight x squared minus 10 straight x plus 4 straight x minus 5 equals 0
2 straight x left parenthesis 4 straight x minus 5 right parenthesis plus 1 left parenthesis 4 straight x minus 5 right parenthesis equals 0
left parenthesis 4 straight x minus 5 right parenthesis left parenthesis 2 straight x plus 1 right parenthesis equals 0
4 straight x minus 5 equals 0 comma space 2 straight x plus 1 equals 0
straight x equals 5 over 4 comma space straight x equals negative 1 half

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