Math Problem Statement

若方程x²+px+q=0的两个根是-2和3,则p,q的值分别为______。

Solution

The question asks for the values of pp and qq in the quadratic equation:

x2+px+q=0x^2 + px + q = 0

It provides two roots of the equation: 2-2 and 33.

Using Vieta's formulas for a quadratic equation x2+px+q=0x^2 + px + q = 0, where the roots are r1r_1 and r2r_2:

  1. The sum of the roots is equal to p-p:
    r1+r2=pr_1 + r_2 = -p In this case: 2+3=1    p=1-2 + 3 = 1 \implies p = -1

  2. The product of the roots is equal to qq:
    r1×r2=qr_1 \times r_2 = q In this case: 2×3=6    q=6-2 \times 3 = -6 \implies q = -6

Therefore, the values of pp and qq are:

p=1,q=6p = -1, \quad q = -6

Would you like further explanation on how Vieta's formulas work?

Here are 5 questions to expand your understanding:

  1. How do Vieta’s formulas apply to higher-degree polynomials?
  2. What are the conditions for a quadratic equation to have real roots?
  3. How can you derive the quadratic formula from the standard form of a quadratic equation?
  4. Can a quadratic equation have complex roots, and how would that affect pp and qq?
  5. How do you factor a quadratic equation based on its roots?

Tip: The discriminant Δ=b24ac\Delta = b^2 - 4ac helps determine the nature of the roots—real or complex—of a quadratic equation.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Vieta's Formulas

Formulas

Vieta's formulas
Quadratic equation formula

Theorems

Vieta's Theorem

Suitable Grade Level

Grades 7-9