Question 1088882
In the xy plane, the point (-1,2) is the minimum of the quadratic function f(x)=x^2+ax+b. What's the absolute value of a-2b?
<pre>Correct answer: {{{highlight_green(4)}}}, since the question asks for the ABSOLUTE VALUE of a - 2b. 
a - b = - 4, but |a - 2b| = 4.