Question

Use the quadratic formula to determine the exact solutions to the equation.

x2−2x−4=0

Answer 1

The correct answer is:

1 + √5 or 1 - √5

i just took the test and these were the answers :)

Answer 2

The quadratic formula

`x=(-b\pm√(b^2-4ac))/(2a)`
for equation

`ax^2+bx+c=0`

In the given case

`x^2-2x-4=0`
a=1
b=-2
c=-4
Substitute in the quadratic equation

`x=(-(-2)\pm√((-2)^2-4(1)(-4)))/(2(1))`

`=(2\pm√(4+16))/(2)`

`= 1\pm√(5)`