Answer:
20% discount
Step-by-step explanation:
Hope you could get an idea from here.
Doubt clarification - use comment section.
Ignore the -4y term for now. Only focus on x^2+20x+100. This can be factored to (x+10)^2. Notice how expanding it out gives
(x+10)^2 = (x+10)(x+10)
(x+10)^2 = x(x+10) + 10(x+10)
(x+10)^2 = x^2+10x + 10x + 100
(x+10)^2 = x^2 + 20x + 100
So this means
x^2+20x-4y+100 = 0
turns into
(x+10)^2 - 4y = 0
after we factor
The second equation listed above implies that we have a parabola because we can solve for y to get
-4y = -(x+10)^2
y = (1/4)(x+10)^2
------------------------------------
square root of 256 is 16 :
------------------------------------
------------------------------------
√10¹⁰ = 10⁵ :
------------------------------------
------------------------------------
√y⁶ = y³ :
------------------------------------