If the quadratic equation x^2 + px + q = 0 has roots 3 and -2, what is the value

Practice Questions

Q1
If the quadratic equation x^2 + px + q = 0 has roots 3 and -2, what is the value of p + q? (2023)
  1. 1
  2. 5
  3. 7
  4. 3

Questions & Step-by-Step Solutions

If the quadratic equation x^2 + px + q = 0 has roots 3 and -2, what is the value of p + q? (2023)
  • Step 1: Identify the roots of the quadratic equation, which are given as 3 and -2.
  • Step 2: Use Vieta's formulas to find p. According to Vieta's, p is the negative sum of the roots. So, calculate 3 + (-2) = 1.
  • Step 3: Since p is the negative of that sum, p = -1.
  • Step 4: Now, use Vieta's formulas to find q. According to Vieta's, q is the product of the roots. So, calculate 3 * (-2) = -6.
  • Step 5: Now that we have p = -1 and q = -6, add them together to find p + q. So, calculate -1 + (-6) = -7.
  • Vieta's Formulas – These formulas relate the coefficients of a polynomial to sums and products of its roots.
  • Quadratic Equations – Understanding the standard form of quadratic equations and how to manipulate them to find roots.
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