what is the value of a^4 - b^4 = ?
1) a^2 - b^2 = 16
2) a+b= 8
I chose A because I thought you could raise everything by 2 like this:
(a^2 )^2- (b^2)^2 = (16)^2
which = a^4- b^4 = 256
But OA is c
please expalin why my logic is wrong[/spoiler]
1) a^2 - b^2 = 16
2) a+b= 8
I chose A because I thought you could raise everything by 2 like this:
(a^2 )^2- (b^2)^2 = (16)^2
which = a^4- b^4 = 256
But OA is c
please expalin why my logic is wrong[/spoiler]
