If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x^2-(2*x)-15 = 0
x^2-(2*x)-15 = 0
x^2-(2*x)-15 = 0
x^2-2*x-15 = 0
x^2-2*x-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+2)/(1*2) or x = (2-64^(1/2))/(1*2)
x = 5 or x = -3
x in (-oo:-3) U (-3:5) U (5:+oo)
(2*x^2+7*x+3)/(x^2-(2*x)-15) = 0
(2*x^2+7*x+3)/(x^2-2*x-15) = 0
2*x^2+7*x+3 = 0
2*x^2+7*x+3 = 0
DELTA = 7^2-(2*3*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-7)/(2*2) or x = (-25^(1/2)-7)/(2*2)
x = -1/2 or x = -3
(x+3)*(x+1/2) = 0
x^2-2*x-15 = 0
x^2-2*x-15 = 0
DELTA = (-2)^2-(-15*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)+2)/(1*2) or x = (2-64^(1/2))/(1*2)
x = 5 or x = -3
(x+3)*(x-5) = 0
((x+3)*(x+1/2))/((x+3)*(x-5)) = 0
( x+1/2 )
x+1/2 = 0 // - 1/2
x = -1/2
( x+3 )
x+3 = 0 // - 3
x = -3
x in { -3}
x = -1/2
| 4x+2y=10fory | | -5*3/34=3c | | -5(w+7)=3w-19 | | 3(-2)(-1)(-3)(-5)= | | 28.9/17 | | (-1)(-4)(-7)= | | x^2+5x=x^2+6x | | 3v^2-2v-5=0 | | -2(-5)(-1)(4)=x | | 3(-4)(-2)=x | | 39-44=x | | 6-(-11)=x | | 2-(-6)=x | | (6+u)(2u+5)=0 | | -31-33=x | | -15+2y=1 | | -36-47=x | | -15=6(v-3)-3v | | -1-(-2)=x | | A=1.2a | | 46=460*0.02t | | -1.2u-5.6=-4u+1.6 | | 42-48=x | | 7.2+3.4n=n+44.9 | | -11-(-5)=x | | (7x-21)(x^2+10x+21)=0 | | -6v-1=-3v+14 | | 27=x+36 | | 5(x+3)+3x=3(x+5)+5x | | 18=x+36 | | 7(x+3)=5(7+4x)-13x | | -7v+16=-5+10 |