What are the solutions to m^2 - 9 = 0? a. m = - 9 and m = 0 b. m = - 3 and m = 3 c. m = - 3 d. m = 9

2 ways

zero product property

easy way

zero product

factor perfect square

m^2-3^2=0

(m-3) (m+3) = 0

set each to zero

m-3=0

x=3

m+3=0

m=-3

m=-3 or 3

easy way

add 9 to both sides

m^2=9

sqrt both sides remember to take postive and negative roots

m=+/-3

m=-3 or 3

B is answer