Question

3x²+2x+15=0 then find X=?

Answer 1

a=3 b=2 c=15
apply this formula u get
= -b+-√b^2-4ac/2a
u get

Answer 2

Given 3x^2 + 2x + 15 = 0 can be written as

           3x^2 + 2x = -15

            x^2 + 2x/3 = -5

           Multiply (1/3) on both sides.

            x^2 + 2x/3 + 1/3 = -5 + (1/3)^2

            x^2 + 2x/3 + 1/3 = -5 + 1/9

            x^2 + 2x/3 + 1/3 = -44/9

           (x + 1/3)^2 = -44/9

           x + 1/3 = root -44/root 9

           x + 1/3 = root -1 * root 44/root 9

           x + 1/3 = i root 44/root 9

           x + 1/3 = i root 44/3

           x + 1/3 = i 2 root11/3

            x = -1+2i root11/3  (or) -1 - 2iroot11/3.


Hope this helps!