Question

What are the solutions to 3x^2+15=-6x?
a) -1+or-i
b) -1+or-2i
c) -2+or-i
d)-2+or-2i
please answer soon

Answer 1

3x^(2)+15=-6x

3x^(2)+6x+15=0

3(x^(2)+2x+5)=0

x^(2)+2x+5=0
quadratic equation
x=(-b+-sqrt(b^(2)-4ac))/(2a) where ax^(2)+bx+c=0

x=(-2+-sqr((2)^(2)-4(1)(5))/2

x=(-2+-4i)/2

x=(-2+-4i)/2
----------------------
x=-1+2i

x=-1-2i
----------------------
x=-1+2i,-1-2i

Answer 2

thank you so much :)