Question

Solve the following equation using the formula: 

x² + 2x – 6 = 0

Answer 1

x² + 2x – 6 = 0 

Here a = 1, b = 2 and c = −6 

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

= `(-(2) +- sqrt((2)^2-4(1)(-6)))/(2(1))`  

= `(-2 +- sqrt(28))/2`

= `(-2 +- 2sqrt(7))/2`

= `-1 +- sqrt(7)`