Graph the quadratic y=x2+3x+8 . What is the x-intercept(s)?(1 point)

Responses

−1.5
negative 1.5

(0,8)
left parenthesis 0 comma 8 right parenthesis

There is no x-intercept.
There is no x -intercept.

(−1.5,5.75)

1 answer

To find the x-intercepts of the quadratic equation \(y = x^2 + 3x + 8\), we need to set \(y\) to 0 and solve for \(x\):

\[ 0 = x^2 + 3x + 8 \]

To find the x-intercepts, we can use the quadratic formula, which is given by:

\[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \]

For the equation \(x^2 + 3x + 8\):

  • \(a = 1\)
  • \(b = 3\)
  • \(c = 8\)

Now substituting these values into the quadratic formula:

  1. Calculate the discriminant (\(b^2 - 4ac\)):

\[ b^2 - 4ac = 3^2 - 4(1)(8) = 9 - 32 = -23 \]

Since the discriminant is negative (\(-23\)), there are no real solutions for \(x\). This means that the quadratic does not cross the x-axis, and therefore there are no x-intercepts.

Thus, the answer is:

There is no x-intercept.