Okay
Assuming you know quadratic formula it would be
-4+/- square root 4^2 -4(2)(-3)
Divided by 2(2)
So
First we’ll do whatever is under the square root
4x4= 12
-4(2)(-3) = 24
so 12+24= 36
36 square root is 6
So 4+/- 6
Divided by 4
So
4+(-6)= -2
4-(-6)= -10
-2 divided by 4 = -0.5
-10 divided by 4 = -5
An easy way to remember this is label your numbers Ax^2+Bx+C
Or it’s much easier to use completing the perfect square.