Question

Lian needs to solve the quadratic equation: x^2 - 4x - 2 = 0. Which statement about how Lian should solve this equation is true?​

Answer 1

x = 4.45 or x = - 4.45

Explanation:

Here are the steps:

Substitute the values,

`4+√(-4^2-4(1*-2))` ÷ 2 × 1

x = 2 ± √6

x = 4.45 or x = - 4.45

good luck, i hope this helps :)

Answer 2

Explanation:

Remark

This sounds like there should be choices. I will make a couple of suggestions.

Suggestions

1. You can't factor this by using the factors of 2 (like +/- 2 or +/- 1.

2. You must use the quadratic equation.

3. You don't get rational numbers.

4. You do get real numbers.

5. To confirm the equation, you can graph it.

6. You could complete the square which is rather the long way of doing it.

Here is the graph solution

Graph