Question

HELP ASAP

Find the zeros of y = x^2 - 4x - 9 by completing the square.

Answer 1

Answer: x= 2 + √ 13 ,2- √ 13

Explanation:

Replace y with 0 and solve for x

Answer 2

The given equation is :

`y=x^(2) -4x-9`

Replacing y as zero, we get,

`x^(2) -4x-9=0`

Now solving this quadratic equation using formula:

`x1,2=\frac{-b+\sqrt{b^(2)-4ac}}{2a}` and

`x1,2=\frac{-b-\sqrt{b^(2)-4ac}}{2a}`

Putting a=1, b=-4, c=-9 we get

`x=2+√(13)` and
`x=2-√(13)`

So, option B is the correct answer.