Can someone please help me with guess and check factoring?

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- quickstudent

Can someone please help me with guess and check factoring?

- jamiebookeater

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- quickstudent

- quickstudent

@Nnesha ? I need your help

- anonymous

whats the problem

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## More answers

- anonymous

http://www.virtualnerd.com/algebra-2/quadratics/solve-equations-by-factoring/factoring-strategies/factor-by-guess-and-check

- quickstudent

In my homework, I'm supposed to factor the expression x^2 + 8x - 9 using the guess and check method. I know that that means I have to find two numbers that add up make the second term and multiply to make the third term. But I can't think of any numbers that add up to 8 and multiply to -9. I don't know what to do now.

- Nnesha

factors of 9 are 1 ,3 9
what two number would you multiply to get -9 but when u add/subtract them you should 8

- Nnesha

guess and check so play with signs
one of the number suppose to be negative

- quickstudent

Wait, in the guess and check method you can subtract also?

- Nnesha

yes you can
you can add or subtract both numbers to get the middle term (b which is 8 in this equation )

- quickstudent

Oh I got it! -1 and 9. -1 + 9 = 8, and -1 * 9 = -9

- Nnesha

\(\huge\color{green}{\checkmark}\) right :=)

- quickstudent

So the factors should be: (x - 1) (x + 9)
Correct?

- Nnesha

right leading coefficient is one so you can write it as (x + (1st number)) (x+ (2nd number))
good job! :=)

- quickstudent

Thanks Didi! :D

- Nnesha

np :=) didi ;D

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