Question

I don't understand how to further answer the question. Can somebody explain with an image of the work??

Solve by completing the square.
-3x^2+12x-15=0

Answer 1

-3x^2+12x-15=0
-3x^2+12x       =15
-3x^2+12x+36=15

Answer 2

-3(x^2+4x-5)
= -3(x-2)^2-3=0
this is ur answer