If the polynomial P(x) = x^2 - 5x + 6 has roots r1 and r2, what is the value of

Practice Questions

Q1
If the polynomial P(x) = x^2 - 5x + 6 has roots r1 and r2, what is the value of r1 + r2?
  1. 5
  2. -5
  3. 6
  4. -6

Questions & Step-by-Step Solutions

If the polynomial P(x) = x^2 - 5x + 6 has roots r1 and r2, what is the value of r1 + r2?
  • Step 1: Identify the polynomial given in the question, which is P(x) = x^2 - 5x + 6.
  • Step 2: Recognize that this is a quadratic polynomial of the form ax^2 + bx + c, where a = 1, b = -5, and c = 6.
  • Step 3: Recall Vieta's formulas, which state that for a quadratic polynomial ax^2 + bx + c, the sum of the roots (r1 + r2) is equal to -b/a.
  • Step 4: In our polynomial, b is -5 and a is 1.
  • Step 5: Substitute the values into the formula: r1 + r2 = -(-5)/1.
  • Step 6: Simplify the expression: r1 + r2 = 5/1 = 5.
  • Step 7: Conclude that the value of r1 + r2 is 5.
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