x^2-x-42
I know you do (x )(x ) and then i get stuck at x-42?

Question

x^2-x-42
I know you do (x  )(x  ) and then i get stuck at x-42?

gw2011 · Answer

First find the factor of x^2, then find the factors of 42

mathstudent55 · Answer

Look for two numbers that multiply to -42 and add up to -1

anonymous · Answer

Is that actually possible? can something multiply to -42 but add up to -1?!

mathstudent55 · Answer

Try 6 and 7, keeping in mind one must be positive and one negative.

gw2011 · Answer

Yes, what two numbers do you get when multiplied together gives you 42?

anonymous · Answer

ohh its -6 and 7 right ?

gw2011 · Answer

The two factors of 6 and 7 are correct but look at the middle term of -x which means the larger number has to be a minus.

anonymous · Answer

so it would be 6 and -7?

mathstudent55 · Answer

-6 and 7 do multiply to -42 but add to +1.

mathstudent55 · Answer

Right

gw2011 · Answer

Yes, it is +6 and -7

mathstudent55 · Answer

6 and -7. Now just write these numbers in the parentheses and you're done.

anonymous · Answer

Dang you both are so awesome... How do you guys know this stuff no problem!? Thank you(:

gw2011 · Answer

I'm glad you understand

mathstudent55 · Answer

Hours, and hours of studying. As you keep doing it and practicing, you'll get better at it.

anonymous · Answer

Wow. well i will continue for hours and hours thank you(:

gw2011 · Answer

Just keep at it and don't give up