sistersbypride sistersbypride

08-11-2018
Mathematics

contestada

find the solutions to the equation below check all that apply
9x^2-81=0

A. x=9
B. x=1
C. x=-9
D. x=-3
E. x=3
F. x=-81

Respuesta :

wegnerkolmp2741o wegnerkolmp2741o

08-11-2018

9x^2-81=0

add 81 to each side

9x^2 = 81

divide by 9

x^2 =9

take the square root of each side

x = + - sqrt (9)

x=+3,-3

Choices D,E

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