Question

DIfference of squares, Please check my work :)

Answer 1

Question: \(64-121x^2\)
Work:
\(\sqrt{121x^2}=11, \sqrt{64}=8\)
: (11x+8)(11x-8)=0
\(x=-\frac{ 8 }{ 11 }, x=\frac{ 8}{ 11 }\)

I'm not exactly sure if I was supposed to solve and set it equal to Zero, But I did this anyways. I hope this is correct. :)

Answer 2

@hero

Answer 3

If the expression is not set equal to zero then all you have to do is factor the expression. You can only solve equations for x. Expressions are not equations.

Answer 4

OKay So its just (11x+8)(11x-8)

Answer 5

Actually that is not correct.

Answer 6

uhhhh I was told difference of squares you take the square root of both. and write it 2 times

Answer 7

You cannot switch the order of the terms in a subtraction

Answer 8

What do you mean?

Answer 9

is it just (11x-8)?

Answer 10

\(a^2 - b^2 = (a + b)(a - b)\)
\(a^2 - b^2 \ne (b + a)(b - a)\)

Answer 11

uhhh

Answer 12

Also \(a^2 - b^2 \ne b^2 - a^2\)

Answer 13

that sign means plus or minus?

Answer 14

\(\ne\) means not equal

Answer 15

oh...there is a sign that means plus or minus. i just got confused.

Answer 16

so like what am I supposed to do

Answer 17

\(\pm\) is plus-minus

Answer 18

Yes thaat one.

Answer 19

I can't give you the answer but this should help:
\(25 - 4x^2 = (5 + 2x)(5 - 2x)\)

Answer 20

I know. I thought I had the answer which was why I asked to check over it

Answer 21

You have yet to post the correct answer btw.

Answer 22

I understand. I'm working it out.

Answer 23

where the heck did you get 4 and 2 from?!!!!!

Answer 24

You've simply confused the order of the terms

Answer 25

What I posted was an EXAMPLE

Answer 26

oooooh

Answer 27

There is only 2 terms in this whole problem

Answer 28

I guess the help video did not help.

Answer 29

nope

Answer 30

They Don't make sense. They always talk about some kind of large word and somehow do all this rocket science and get the same answer

Answer 31

So the formula is

\(a^2 - b^2 = (a + b)(a - b)\)

Sample Problem:
\(49 - 100x^2\)

1. Note the values of \(a\) and \(b\):
In this case, \(a = 7\) and \(b = 10\)

2. Therefore the factored form of \(49 - 100x^2\) is:
\((7 - 10x)(7 + 10x)\) <-- Correct factorization


3. Do not factor this way:
\((10x + 7)(10x - 7)\) <--- Incorrect factorizations

Answer 32

-_- you could have just told me to switch it this entire time. instead of doing all this. u_u

Answer 33

-_- oh

Answer 34

OKAY my bad

Answer 35

AND you still have yet to post the correct answer.

Answer 36

-_- i'm anooying people in the all sub sorry. The right answer is (8-11x)(8+11x)

Answer 37

Finally.

Answer 38

-_-