tyreek03 tyreek03

03-04-2019
Mathematics

contestada

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

Respuesta :

kayleemendoza2 kayleemendoza2

05-04-2019

Answer:

1. B 2. C

Step-by-step 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

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