Questions: Solve. 5 y^3 - 34 y^2 - 7 y = 0 y =

Solve.
5 y^3 - 34 y^2 - 7 y = 0
y =
Transcript text: Solve. \[ 5 y^{3}-34 y^{2}-7 y=0 \] \[ y= \]
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Solution

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Solution Steps

Solution Approach

To solve the equation \(5y^3 - 34y^2 - 7y = 0\), we first factor out the common term \(y\), giving us \(y(5y^2 - 34y - 7) = 0\). This implies that one solution is \(y = 0\). For the quadratic equation \(5y^2 - 34y - 7 = 0\), we can use the quadratic formula \(y = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\) to find the other solutions, where \(a = 5\), \(b = -34\), and \(c = -7\).

Step 1: Factor the Equation

We start with the equation

\[ 5y^3 - 34y^2 - 7y = 0. \]

Factoring out the common term \(y\), we have

\[ y(5y^2 - 34y - 7) = 0. \]

This gives us one solution:

\[ y = 0. \]

Step 2: Solve the Quadratic Equation

Next, we need to solve the quadratic equation

\[ 5y^2 - 34y - 7 = 0. \]

Using the quadratic formula

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

where \(a = 5\), \(b = -34\), and \(c = -7\), we first calculate the discriminant:

\[ b^2 - 4ac = (-34)^2 - 4 \cdot 5 \cdot (-7) = 1156 + 140 = 1296. \]

Taking the square root of the discriminant, we find

\[ \sqrt{1296} = 36. \]

Now we can find the two solutions:

\[ y_1 = \frac{34 + 36}{10} = \frac{70}{10} = 7, \]

\[ y_2 = \frac{34 - 36}{10} = \frac{-2}{10} = -0.2. \]

Step 3: Compile All Solutions

The complete set of solutions to the original equation is:

\[ y = 0, \quad y = 7, \quad y = -0.2. \]

Final Answer

The solutions are

\[ \boxed{0, 7, -0.2}. \]

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