Question

Which are the solutions of x2 = –13x – 4? 0, 13 0, –13

Answer 1

It's defiantly not C. I made a 90% but missed this question. I hope this helps you cross it down. My next guess would be D.

Answer 2

Option 3 and 4 - 0,-13

Explanation:

Given : Expression
`x^2=-13x-4`

To find : What are the solutions?

Solution :

The quadratic formula of the quadratic equation
`ax^2+bx+c=0` is

`x=(-b\pm√(b^2-4ac))/(2a)`

Comparing with general equation,
`x^2+13x+4=0`

where, a=1 ,b=13, c=4

Substitute in the formula,

`x=(-b\pm√(b^2-4ac))/(2a)`

`x=(-13\pm√(13^2-4(1)(4)))/(2(1))`

`x=(-13\pm√(169-16))/(2)`

`x=(-13\pm√(153))/(2)`

`x=(-13+√(153))/(2),(-13-√(153))/(2)`

The value of x is
`x=-0.315,-12.68`

Approximately the solution of the expression is x=0,-13.