Question 1133223
Hi

what is the vertex and the axis of symmetry of the following parabola. 

f(×)= 2x^2+6x+7

Thanks
<pre>x-coordinate of vertex, or axis of symmetry = {{{highlight_green(matrix(1,9, - b/(2a), "=", - 6/(2 * 2), "=", - 6/4, "=", - 3/2, "or", - 1.5))}}}
Substituting y for f(x), and - 1.5 for x, we get: {{{highlight_green(system(matrix(1,3, f(x), "=", 2x^2 + 6x + 7), matrix(1,9, y, 
"=", 2(- 1.5)^2 + 6(- 1.5) + 7, "=====>", y, "=", 4.5 - 9 + 7, "=", 2.5), matrix(1,3, "Vertex:", "(- 1.5,", "2.5)")))}}}
You don't have to complete the square in order to get the answer, unless instructed to, of course! 
IGNORE all other NONSENSICAL answers, such as y-coordinate of vertex is 4.8.