Question

Simplify (x^2 + 16)(x^2 – 16) = ?
Btw, i don't want a direct answer. I want an explanation as to how to achieve a correct answer. (P.s.) Thanks a ton! ^_^

Answer 1

@AravindG @pooja195

Answer 2

@dan815 @acxbox22

Answer 3

do yu know fomula a^2 -b^2 = (a-b)(a+b)
yes ?

try us this here --- ok ?

Answer 4

k, thanks. I'll try it. ^_^

Answer 5

i like see it now - ok ?

Answer 6

so, basically, i do: x^2^2 - 16^2 ?

Answer 7

yes but you need simplify it not make more complex

Answer 8

so, i do: x^3 - 16^2 ?

Answer 9

do you understand my words above ?

Answer 10

i think so?

Answer 11

ok than try it to simplify - ok ?

Answer 12

so... x^4 + 32?

Answer 13

how you have got 32 ? 16*16 not equal 32 - yes ?
so but i have said to you above that you need simplify it not make more complex - yes ?

Answer 14

oh, sorry i mathed wrongly. i meant: x^4 + 256

Answer 15

that one is it right?

Answer 16

do you have same choices ?

Answer 17

?

Answer 18

here are my choices
A. x^4 – 256
B. x^4 + 32
C. x^4 + 256
D. x^4 – 32

Answer 19

but this not is right

because formula say that (a-b)(a+b)=a^2 -b^2

Answer 20

do you see where is wrong your above answer ?

Answer 21

so ... i do A. than?

Answer 22

x^4 - 256?

Answer 23

yes sure

Answer 24

Thanks! ^_^

Answer 25

was my pleasure - so do you understand it why ?

Answer 26

yes, i understand now, i was not supposed to use +, because it was -

Answer 27

yes but you need learn formulas beaucose you need us them always

Answer 28

Thanks again! ^_^