Question
How many \( x \)-intercepts does the parabola with the following equation have? \( y=2 x^{2}+14 x+22 \) Show your work here Hint To add infinity (0), type "infinity"
Ask by Stephens Allan. in the United States
Nov 26,2024
Real Tutor Solution
Tutor-Verified Answer
Answer
The parabola has 2 \( x \)-intercepts.
Solution
To determine the number of \( x \)-intercepts of the parabola given by the equation
\[
y = 2x^2 + 14x + 22,
\]
we need to find the values of \( x \) for which \( y = 0 \). This means we need to solve the equation:
\[
2x^2 + 14x + 22 = 0.
\]
To find the number of solutions to this quadratic equation, we can use the discriminant, which is given by the formula:
\[
D = b^2 - 4ac,
\]
where \( a \), \( b \), and \( c \) are the coefficients from the quadratic equation \( ax^2 + bx + c = 0 \).
In our case, we have:
- \( a = 2 \)
- \( b = 14 \)
- \( c = 22 \)
Now, we can calculate the discriminant:
\[
D = (14)^2 - 4(2)(22).
\]
Calculating \( (14)^2 \):
\[
14^2 = 196.
\]
Now calculating \( 4(2)(22) \):
\[
4 \cdot 2 \cdot 22 = 176.
\]
Now substituting these values into the discriminant formula:
\[
D = 196 - 176 = 20.
\]
Since the discriminant \( D \) is positive (\( D > 0 \)), this indicates that the quadratic equation has two distinct real solutions. Therefore, the parabola intersects the \( x \)-axis at two points.
Thus, the number of \( x \)-intercepts of the parabola is
\[
\boxed{2}.
\]
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Beyond the Answer
To find the \( x \)-intercepts of the parabola given by the equation \( y = 2x^2 + 14x + 22 \), we need to set \( y \) to zero and solve for \( x \): \[ 0 = 2x^2 + 14x + 22 \] Next, we can use the quadratic formula where \( a = 2 \), \( b = 14 \), and \( c = 22 \): \[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \] Calculating the discriminant: \[ b^2 - 4ac = 14^2 - 4(2)(22) = 196 - 176 = 20 \] Since the discriminant is positive (\( 20 > 0 \)), it indicates that there are two distinct real \( x \)-intercepts. Thus, the parabola intersects the x-axis at two points.