Consider the equation y = ax^2 + bx + c, when a > 0. If a is multiplied by -1, what is true about the graph of the new parabola? A) It is one unit to the left of the original parabola

B) It is narrower than the original parabola

C) It is flipped below the x-axis

D) It is wider than the original parabola

I've been told that the answer is D, but I just don't understand why.
Can anyone help explain?

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation:

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584

20%

step-by-step explanation: