Question

10 points

Answer 1

She did not simplify under the square root correctly.

Quadratic equation

Given the quadratic expression

5x^2 - 6x - 8 = 0

Using the general formula, we will have:

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

From the given equation;

a = 5

b  -6

c = -8

Substitute the values into the formula to have:

$x =\frac{6\pm \sqrt{6^2-4(5)(-8)}}{2(5)}\\ x =\frac{6\pm \sqrt{36+120}}{10}\\x =\frac{6\pm 12.49}{10}$

From the given solution, we can see that she did not simplify under the square root correctly.

Learn more on general formula here; brainly.com/question/21466038