Matt was trying to convert the following parabola in standard form to vertex form by completing the square but has made an error. y = 2x-10x-4 y= 2x-10x y=2x210x +25-25 -5 25 y=2(x-5) 29 4 Which describes where Matt made his first error? Matt should have added 10 and subtracted 10 instead of using the constant 25. Matt should have factored out the leading coefficient 2 on the second step before completing the square. Matt should have doubled the -5 in the last step. Matt should have first subtracted 25 and then added 25 to properly completely the square.