2007-05-10 09:25:31 · 5 answers · asked by Jonathan D 2 in Science & Mathematics ➔ Mathematics
x^2-16
2007-05-10 09:28:35 · answer #1 · answered by bruinfan 7 · 0⤊ 0⤋
For problems like these, you can solve them easily without much effort. All you have to know is this:
(a+b)(a-b) = a^2 - b^2
so in this case, a=x and b=4:
1) (x+4)(x-4) = x^2 - 4^2
2) x^2 - 16
2007-05-10 16:53:09 · answer #2 · answered by Janine 1 · 0⤊ 0⤋
use bedmass times the x's to get x^2 then x by -4 and +4 but these -4x and +4x cancel each other out (4x-4x=0) then times 4 by -4 to get 16
x^2 - 16
2007-05-10 16:32:14 · answer #3 · answered by gordon_benbow 4 · 0⤊ 0⤋
Use FOIL
(x+4)*(x-4)
x*x+x*(-4)+x*4 - 4*4
x^2-16
2007-05-10 16:30:17 · answer #4 · answered by Herbie_Names 2 · 0⤊ 0⤋
x^2-4x+4x-16
x^2-16
2007-05-10 16:29:03 · answer #5 · answered by Anonymous · 0⤊ 0⤋