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  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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Topic review (newest first)

bobbym
2011-07-25 00:18:20

I know, remember that math is a precise language. If we are to understand each other we must agree and abide by its rules.

zee-f
2011-07-25 00:15:02

ok that was by accident

bobbym
2011-07-25 00:14:31

Correct, please do not change x to X, those are different variables and mean different things.

zee-f
2011-07-25 00:12:46

x^2+2x-15
15*x=15x= 5 , -3
(x^2+5x)-(3x-15)
x(x+5)-3(x-5)
(x-3) (X+5)

bobbym
2011-07-25 00:02:02

What did you get?

You should get ( x - 3 ) ( x + 5 )

zee-f
2011-07-25 00:01:38

am ganna do 6 again and see what i did incorrect

bobbym
2011-07-25 00:00:40

For 6) C is correct.

anonimnystefy
2011-07-24 23:59:47

i think that if a polynomial can be factored by any other method than it can also be done by grouping.

bobbym
2011-07-24 23:58:29

It does look like B is correct.

anonimnystefy
2011-07-24 23:56:52

x^2-169=
x^2-13x+13x-169=
x(x-13)+13(x-13)=
(x+13)(x-13)???

bobbym
2011-07-24 23:55:28

That is what I got too.

anonimnystefy
2011-07-24 23:55:12

hi bobbym

could 19 be done by grouping?

zee-f
2011-07-24 23:54:32

19 as e

bobbym
2011-07-24 23:52:09

19?  What did you enter for the answer?

zee-f
2011-07-24 23:49:03

i got #6 and number 19 incorrect

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