What number would you add to both sides of x2 + 7x = 9 to complete the square?!...

which  best  describes the transformation from the graph of  f(x) =  x2  to the graph of  f(x) = (x  – 3)2  – 1?   left 3 units, down 1 unitleft 3 units, up 1 unitright 3 units, down 1 unit  right 3 units, up 1 unit

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Could someone with number 1 and 2