Question 270445
The given equation is y=x^2 + 2x - 6
Use the quadratic formula: x: {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 

The quadratic equation is in the form {{{ax^2 + bx + c = y}}}
Sub the values of a, b, and c into the quadratic formula and solve. Notice that there are two solutions because there is a plus or minus before the square root. So in the end, the two answers are 
x=1/2[-2+sqrt(28)]
and
x=1/2[-2-sqrt(28)]
When this is solved using the calculator, the answer will be as given in decimal form.
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Good luck