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March 5, 2015

March 5, 2015

Posted by **mace** on Thursday, February 21, 2013 at 8:00pm.

- MATH -
**JJ**, Thursday, February 21, 2013 at 8:14pm9x^2 + 5x - 4

the AC method

Multiply the 9 times -4

You have -36

think of factors that will multiple to equal -36 but add to equal the middle number 5.

36 times -1 no

9 times -4 yes

Sometimes it takes awhile to find the right numbers.

Once you do, you write them and -4x + 9x

You replace the middle term with them.

9x^2 -4x + 9x - 4

Next, you factor by grouping

(9x^2 -4x) + (9x - 4)

Take out the common factor in each group.

x(9x-4) + 1(9x-4)

see the (9x-4)... you write that down once and get your other factor from what is left over (x+1)

FINAL ANSWER: (9x-4)(x+1)

Multiply those factors to check to be sure you are correct.

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