Question

One solution to the problem below is 3. What is the other solution? b^2-9=0

Answer 1

do you know how to factor a "difference of squares" ?

Answer 2

well square roots mean even a negative number will be positive -3^2 =9-9=0

Answer 3

when you see (a^2 - b^2)
try to remember you can factor that into
(a+b)(a-b)

Answer 4

the other way to answer is to add +9 to both sides
b^2 -9+9 = 0+9

b^2 = 9

now take the square root of both sides
\[ \sqrt{b^2} = \sqrt{9} \\ b= \pm 3 \]

Answer 5

sissy i dont know..you know we both are dumb..thats why we both in summer school honey <3

Answer 6

its -3

Answer 7

there ya go sis ^

Answer 8

thanks you get aaaaaaa Medal!!! ooooo