Solve the Quadratic Equation: -5x² - 2x - 8 = 0

5x22x8=0 -5x^2-2x-8=0

Solve the equation

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:06 Let's find the value of X.
00:09 First, focus on the coefficients. They're very important.
00:16 Next, we'll use the roots formula. Step by step, I'll guide you.
00:29 Now, substitute the given values in the formula. Let's solve for X together.
00:57 Calculate the products and then find the square.
01:09 If we encounter a negative number under a root, there's no real solution.
01:16 And that's how you find the solution to this question.

Step-by-step written solution

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1

Understand the problem

5x22x8=0 -5x^2-2x-8=0

Solve the equation

2

Step-by-step solution

Let's solve the quadratic equation 5x22x8=0-5x^2 - 2x - 8 = 0 using the quadratic formula:

First, identify the coefficients: a=5a = -5, b=2b = -2, and c=8c = -8.

The quadratic formula is given by:

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

We start by calculating the discriminant, D=b24acD = b^2 - 4ac:

D=(2)24(5)(8)D = (-2)^2 - 4 \cdot (-5) \cdot (-8)

D=4160D = 4 - 160

D=156D = -156

Since the discriminant D=156D = -156 is less than zero, this indicates that there are no real solutions for the quadratic equation 5x22x8=0-5x^2 - 2x - 8 = 0.

Therefore, the equation has no solution in terms of real numbers.

3

Final Answer

No solution

Practice Quiz

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Solve the following equation:

\( 2x^2-10x-12=0 \)

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