1.

open up; vertex (0, -5) 

8.

“Square root it”

x = ± 7.42

2.

open down; vertex (1,7) 

3.

“factor”; x = 4, 9  

4.

“quad formula”; x = -4.2, 1.2

5.

“factor”; x = 4, 2

6.

"factor" to get (2x+1)(x-3);

answer:   x = -¹/₂ , 3

7.

“Complete the square” (first step -> sub 11 fbs, then add 16 tbs) to get è (x - 4)² = 5

answer:   x = 1.76, 6.24