Question

Question #82350

Answer 1

`4`

Explanation:

`"to "color(blue)"complete the square"`

`•color(white)(x)"add "(1/2" coefficient of x-term")^2" to both sides"`

`"that is add "(4/2)^2=4`

`rArrx^2+2(2x)color(red)(+4)=13color(red)(+4)`

`rArr(x+2)^2=17`