Math Problem Statement

Solve for x: x^2 + 9x + 18 = 0. Place the larger solution in Box 1 and the smaller solution in Box 2.

Solution

The equation you need to solve is:

x2+9x+18=0x^2 + 9x + 18 = 0

We can solve this quadratic equation using the quadratic formula:

x=b±b24ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

For the equation x2+9x+18=0x^2 + 9x + 18 = 0, the coefficients are:

  • a=1a = 1
  • b=9b = 9
  • c=18c = 18

Now, let's substitute these values into the quadratic formula:

x=9±924(1)(18)2(1)x = \frac{-9 \pm \sqrt{9^2 - 4(1)(18)}}{2(1)}

First, calculate the discriminant:

Δ=924(1)(18)=8172=9\Delta = 9^2 - 4(1)(18) = 81 - 72 = 9

Now, calculate the two possible values for xx:

x1=9+92=9+32=62=3x_1 = \frac{-9 + \sqrt{9}}{2} = \frac{-9 + 3}{2} = \frac{-6}{2} = -3

x2=992=932=122=6x_2 = \frac{-9 - \sqrt{9}}{2} = \frac{-9 - 3}{2} = \frac{-12}{2} = -6

So, the two solutions are:

  • x1=3x_1 = -3 (the larger solution)
  • x2=6x_2 = -6 (the smaller solution)

Therefore:

  • Box 1 (Larger Solution) = 3-3
  • Box 2 (Smaller Solution) = 6-6

Would you like further clarification on the steps?

Here are five questions related to this:

  1. How is the discriminant used to determine the nature of the roots in a quadratic equation?
  2. Can a quadratic equation have complex solutions? If so, when?
  3. What is the difference between solving quadratics by factoring versus using the quadratic formula?
  4. How does changing the sign of the bb-term affect the solutions?
  5. How does the quadratic formula handle coefficients that are fractions or irrational numbers?

Tip: Always check the discriminant (Δ\Delta) to understand the nature of the roots—whether they're real, equal, or complex.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations

Formulas

Quadratic equation formula ax^2 + bx + c = 0

Theorems

Quadratic formula

Suitable Grade Level

Grades 7-9