The roots of the equation 5x^2 - 20x + 15 = 0 are:

Practice Questions

Q1
The roots of the equation 5x^2 - 20x + 15 = 0 are:
  1. 1
  2. 2
  3. 3
  4. 4

Questions & Step-by-Step Solutions

The roots of the equation 5x^2 - 20x + 15 = 0 are:
  • Step 1: Identify the coefficients in the quadratic equation 5x^2 - 20x + 15 = 0. Here, a = 5, b = -20, and c = 15.
  • Step 2: Write down the quadratic formula: x = [ -b ± √(b² - 4ac) ] / (2a).
  • Step 3: Calculate b² - 4ac. First, find b²: (-20)² = 400. Then calculate 4ac: 4 * 5 * 15 = 300. Now, subtract: 400 - 300 = 100.
  • Step 4: Substitute the values into the quadratic formula: x = [20 ± √(100)] / (2 * 5).
  • Step 5: Calculate √(100), which is 10. Now the formula looks like this: x = [20 ± 10] / 10.
  • Step 6: Solve for the two possible values of x. First, calculate x = (20 + 10) / 10 = 30 / 10 = 3. Then calculate x = (20 - 10) / 10 = 10 / 10 = 1.
  • Step 7: The roots of the equation are x = 3 and x = 1.
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