y=-(2/315)x^2+4x

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Solution for y=-(2/315)x^2+4x equation: 


x in (-oo:+oo)

y = 4*x-((2/315)*x^2) // - 4*x-((2/315)*x^2)

(2/315)*x^2-(4*x)+y = 0

(2/315)*x^2-4*x+y = 0

2/315*x^2-4*x+y = 0

DELTA = (-4)^2-(2/315*4*y)

DELTA = 16-8/315*y

16-8/315*y = 0

16-8/315*y = 0 // - 16

-8/315*y = -16 // : -8/315

y = -16/(-8/315)

y = 630

DELTA = 0  <=>  t_1 = 630

x = 4/(2/315*2) i y = 630

x = 315 i y = 630

( x = ((16-8/315*y)^(1/2)+4)/(2/315*2) or x = (4-(16-8/315*y)^(1/2))/(2/315*2) ) i y > 630

( x = 315/4*((16-8/315*y)^(1/2)+4) or x = 315/4*(4-(16-8/315*y)^(1/2)) ) i y > 630

y-630 > 0

y-630 > 0 // + 630

y > 630

x in { 315, 315/4*((16-8/315*y)^(1/2)+4), 315/4*(4-(16-8/315*y)^(1/2)) }

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