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

ok that was by accident

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

x^2+2x-1515*x=15x= 5 , -3(x^2+5x)-(3x-15)x(x+5)-3(x-5)(x-3) (X+5)

What did you get?You should get ( x - 3 ) ( x + 5 )

am ganna do 6 again and see what i did incorrect

For 6) C is correct.

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

It does look like B is correct.

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

That is what I got too.

hi bobbymcould 19 be done by grouping?

19 as e

19? What did you enter for the answer?

i got #6 and number 19 incorrect