Question

Solve
(pic attached)

Answer 1

Equal matrices mean equal components :)
Like, for example, upper left elements should be equal, so...
3g = -12

divide both sides by 3
g = -4

and so on :D

Answer 2

okay, so the f= 0 right?

Answer 3

Would it be this? would h be a - or a + ? or both
f = 0, g = –4, h = 9

Answer 4

yeah, exactly :D
h can be -9 if you want, but if you can only have one answer for h, then choose 9 :)