Solve using the square root method. x2 - 16 = 0
I just learned all this is my lesson from online school however i didnt learn how to do this specific question... :P
A. {-8, 8}
B. {-4, 4}
C. {8}
D. {4}

Question

amistre64 · Answer

(x+4)(x-4)

anonymous · Answer

wouldn't this be the difference of two squares? if so the answer would be B. If you (x-4)(x+4) the middle numbers will cancell and leave you with (x^2-16)

amistre64 · Answer

its a difference of squares :)  you have to be able to see them but its what happens when you multiply conjugates like:

(x+4)(x-4)

anonymous · Answer

ohhhhh wow thanx i probably just over thought it of course :P lol