Question

Show work please!!! Solve the equation by completing the square. If necessary, round to the nearest hundredth.

x^2-18x=19

A. 1;19
B.-1;19
C.3;6
D.-3;1

Solve x^2-81=0

A.0
B.-9
C.-9,9
D.9

Answer 1

1. B 2. C

Explanation:

1. x^2-18x+(18/2)^2=19+(18/2)^2

(x-18/2)^2=100

(x-9)^2=100

x1= -1 x2= 19

2. x^2=81

x=+-9

x1=-9 x2=9