If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y = (-1/16)*x^2+2*x+5 // - (-1/16)*x^2+2*x+5
y-((-1/16)*x^2)-(2*x)-5 = 0
(1/16)*x^2-2*x+y-5 = 0
1/16*x^2-2*x+y-5 = 0
DELTA = (-2)^2-(1/16*4*(y-5))
DELTA = 4-1/4*(y-5)
4-1/4*(y-5) = 0
4-1/4*(y-5) = 0
21/4-1/4*y = 0
21/4-1/4*y = 0
21/4-1/4*y = 0 // - 21/4
-1/4*y = -21/4 // : -1/4
y = -21/4/(-1/4)
y = 21
DELTA = 0 <=> t_1 = 21
x = 2/(1/16*2) i y = 21
x = 16 i y = 21
( x = ((4-1/4*(y-5))^(1/2)+2)/(1/16*2) or x = (2-(4-1/4*(y-5))^(1/2))/(1/16*2) ) i y > 21
( x = 8*((4-1/4*(y-5))^(1/2)+2) or x = 8*(2-(4-1/4*(y-5))^(1/2)) ) i y > 21
y-21 > 0
y-21 > 0 // + 21
y > 21
x in { 16, 8*((4-1/4*(y-5))^(1/2)+2), 8*(2-(4-1/4*(y-5))^(1/2)) }
| 2x+8=4/7+4 | | h(x)=(-.08x^2+.8x-2)+3 | | 65+(x+2)=90 | | 5t-26=18 | | 6(-3x+3)=72 | | 5=35/w | | 29+(x-5)=90 | | 29+(x-5)=180 | | 24n(n-11)=0 | | (3y^3)+(2y^2)-(27y)-(18)=0 | | (2500/100+50)+(98*2-15)= | | (f+4)(2f-5)=0 | | .2m-.5=.1m+.7 | | n+(2n)+(2n+7)=122 | | (x+6)(x-3)=0 | | 0.007h=0.2002 | | n+(2n+7)+(2n+7)=122 | | -12x--9=-32 | | 2x^3+8x^2+30x=0 | | (1085/5+15-6)+(64/8-46)= | | -2k--11=7 | | -12.42=0.03 | | 43+(x-7)=180 | | y=5x+-9 | | 3x+4x+5x=360 | | 43+(x-7)=90 | | 283.5=0.5*(x*21) | | 6+3f=-15 | | 6r+21=27 | | 4x+3x+6x=180 | | x(2)+15=24 | | 20d+40=40 |