Solve the radical equation to find the two solutions. Round to one decimal place if needed.

^3 square root of 2x^2+19x+17=2

1 answer

To solve the radical equation:

\[ \sqrt[3]{2x^2 + 19x + 17} = 2 \]

we begin by eliminating the cube root on the left side. We do this by cubing both sides of the equation:

\[ 2x^2 + 19x + 17 = 2^3 \]

Calculating \(2^3\):

\[ 2^3 = 8 \]

So the equation simplifies to:

\[ 2x^2 + 19x + 17 = 8 \]

Next, we subtract 8 from both sides to set the equation to zero:

\[ 2x^2 + 19x + 17 - 8 = 0 \]

This simplifies to:

\[ 2x^2 + 19x + 9 = 0 \]

Now, we can use the quadratic formula to solve for \(x\), where \(a = 2\), \(b = 19\), and \(c = 9\):

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

First, we calculate the discriminant:

\[ b^2 - 4ac = 19^2 - 4 \cdot 2 \cdot 9 \]

Calculating \(19^2\):

\[ 19^2 = 361 \]

Calculating \(4 \cdot 2 \cdot 9\):

\[ 4 \cdot 2 \cdot 9 = 72 \]

Now subtract:

\[ 361 - 72 = 289 \]

The discriminant is \(289\). Now we can find the solutions using the quadratic formula:

\[ x = \frac{-19 \pm \sqrt{289}}{2 \cdot 2} \]

Since \( \sqrt{289} = 17 \), we have:

\[ x = \frac{-19 \pm 17}{4} \]

Calculating both potential solutions:

  1. First solution:

\[ x = \frac{-19 + 17}{4} = \frac{-2}{4} = -\frac{1}{2} = -0.5 \]

  1. Second solution:

\[ x = \frac{-19 - 17}{4} = \frac{-36}{4} = -9 \]

The two solutions are:

\[ x = -0.5 \quad \text{and} \quad x = -9 \]

Thus, the two solutions are:

\[ \boxed{-0.5} \quad \text{and} \quad \boxed{-9} \]