Identify the range of the equation y = -x2 - 12x + 3.
A:All real numbers
B:y ≤ 39
C:y ≥ −6
D:y ≤ −105

Question

Identify the range of the equation y = -x2 - 12x + 3.
A:All real numbers
B:y ≤ 39
C:y ≥ −6
D:y ≤ −105

anonymous · Answer

now the range huh?

anonymous · Answer

locate the vertex using x=-b/(2a)... what value did you get?

keana · Answer

if i remembered how to do that, this wouldn't be an issue

anonymous · Answer

use x=-b/(2a)
can you identify a, b in $\large y=ax^2+bx+c $ according to your equation?

keana · Answer

i really don't have a clue how to do it, which is why i need it to be explained !

anonymous · Answer

here all you have to do is match up with the equation i gave u...
$\large y=ax^2+bx+c $
$\large y=-x^2-12x+3 $

just match up the numbers so you can find out what a and b are...

keana · Answer

ok but i don't think i understand what that does. how does it change anything?? isn't it still the same??? i need an explanation please because i don't understand

anonymous · Answer

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