Respuesta :

x^2 - 8x-9=0
D = b^2- 4*a*c = 64- 4* (-9) = 64+36=100 =10^2
X1 = (8-10)/2 = -1
X2= (8+10)/2= 9


Answer:

1. x^2 + -8x = 9

2. for the next part it is add 16

3. after that it is (x - 4)^2 = 25

4. the last one is -1 and 9

Step-by-step explanation:

i know this is wayy late but in case anyone needs it :)