Question #34b64

1 Answer
May 15, 2017

x=1

Explanation:

First, add 7 on both sides so that it's in the form ax^2+bx+c=0

7r^2-14r+7=0

Now that we have it in the form, ax^2+bx+c, we can identify:

a=7
b=-14
c=7

The quadratic formula is:

x=(-b+-sqrt(b^2-4ac))/(2a)

Plug into the formula:

x=(14+-sqrt(14^2-4(7)(7)))/(2(7))

Solve inside the square root:

x=(14+-sqrt(0))/(2(7))

sqrt(0) is just 0. So our answer is:

x=14/14

That is:

x=1