Factor x2 - 121.
A) (x - 11)(x + 11)
B) (x + 11)(x - 11)
C) Both A and B
D) Neither A nor B
2007-05-31 02:27:53 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
C. Use foil to get the answer
F = x^2
O = 11x
I = -11x
L = -121
2007-05-31 02:32:02 · answer #1 · answered by Lady Geologist 7 · 0⤊ 0⤋
This is an example of a difference of squares.
x^2 is the square of x, and 121 is the square of 11, so we have:
x^2 - (11)^2
The rule do go by when factoring a difference of squares is
(first number + second number)*(first number minus second number).
By first number I mean 'x', and by second number I mean 11.
So your answer is (x+11)(x-11).
And of course this is the same as (x-11)(x+11).
2007-05-31 02:32:02 · answer #2 · answered by Mikey C 2 · 0⤊ 0⤋
x2-121
x2-(11)2
(x-11)(x+11)
{(x-11)(x+11)}= {(x+11)(x-11)}
so ans------(C)BOTH A&B
2007-05-31 03:55:13 · answer #3 · answered by cool 2 · 0⤊ 0⤋
C because A & B are the same answer.
2007-05-31 02:32:28 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Answer is C
2007-05-31 02:39:29 · answer #5 · answered by mydogshiro 2 · 0⤊ 0⤋
c
2007-05-31 02:31:47 · answer #6 · answered by xandyone 5 · 0⤊ 0⤋