## Ben103 Group Title t^2+6t-7. Is their a 2 numbers that equael product -7 and sum 6. Is it just me or thats not possible? one year ago one year ago

1. KingGeorge Group Title

That's just you :) There are indeed two numbers that multiply to be -7, and add to be 6. Think about it a bit and I'm sure you'll get it.

2. Ben103 Group Title

Well the equation is set up as (a+1) (a-7) thats what I got. but 1-7=-6 so that doesnt work.

3. miszery Group Title

remember that - and + in front of the numbers

4. Azteck Group Title

Wrong way around mate

5. KingGeorge Group Title

That's very close.

6. Ben103 Group Title

ok got it switched them. Now it works.

7. KingGeorge Group Title

Excellent!

8. Ben103 Group Title

Thanks lol I cant believe i cudnt figure tthat out

9. KingGeorge Group Title

No problem. We've all had something obvious pass us by before :P

10. Ben103 Group Title

would the solution set be written as (a+7) (a-1) or just {7,-1}

11. miszery Group Title

are you factorizing? normally it wuold be written as full.

12. UnkleRhaukus Group Title

you could always use the quadratic formula $t=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

13. miszery Group Title

(a+7)(a-1) that is.... you will need to use the full factors to use in equations.

14. KingGeorge Group Title

The solution set would be {-7,1}. Note that you have -7 and +1 because if $$a+7=0$$, then $$a=-7$$. Similarly, $$a-1=0\implies a=1$$.

15. miszery Group Title

@Ben103 sorry the questions look like what I'm doing at school at the moment which is factorizing :( I could be wrong

16. miszery Group Title

@KingGeorge knows more than me i'm sure! lol I'm only doing high school maths

17. KingGeorge Group Title

As another tip, if you're asked for a solution SET, your final answer should look like {_,_,_,...,_}. I.e., you have a list of things in the curly brackets.

18. Ben103 Group Title

Ok thanks I understand it now. :)

19. KingGeorge Group Title

You're welcome.